diff --git a/Script.org b/Script.org
index 2121d2a..91965a8 100644
--- a/Script.org
+++ b/Script.org
@@ -346,39 +346,103 @@ le plan sans rien supprimer, et =--yes= pour omettre la confirmation
 interactive.
 
 * Autres
-** Recorrection d'une seule copie (peu testé)
+** Recorrection d'une copie ou de quelques questions
 
-!! Attention, refaire ne marchera pas si tu fais une annotation non
-groupée into refaire !!
+Dans le GUI, ouvrir la section =Refaire des copies (facultatif)=,
+repliée par défaut. Ajouter les copies et leurs questions depuis les
+listes déroulantes, ou choisir =Toute la copie=, puis enregistrer la
+sélection. Le dossier du passage principal est présélectionné d'après
+le dernier mode utilisé et les dossiers présents ; vérifier ce choix.
+Pour reprendre une même question dans toute la classe, choisir
+=Toutes les copies=, sélectionner la question, puis =+ Ajouter=.
+Seules les copies ayant un PDF de réponse pour cette question (normal
+ou =_new=) sont ajoutées ; le nombre de copies sans réponse est affiché.
+Une copie déjà sélectionnée entièrement reste sélectionnée entièrement.
 
- 1. Redécoupage
-    + =python -m copienator review-labels InterroTest/Copie01.pdf=
-    + =python -m copienator split-answers InterroTest/Copie20.pdf=
- 2. Créer =refaire.json=, avec un contenu comme
+Les boutons =Corrigés (Sol)= et =Consignes de notation (Persp)= ouvrent
+les dossiers des textes utilisés par la correction. Modifier et enregistrer
+les fichiers des questions concernées avant de relancer =Refaire la correction=.
+Ces boutons sont aussi disponibles dans le parcours principal.
+
+Le choix =PDF à vérifier= propose =Automatique=, =Par question (groupé)=
+ou =Par copie=. En automatique, une question présente dans plusieurs
+copies déclenche le regroupement ; sinon les PDF sont produits par copie.
+Les groupes sont limités en hauteur : une question pour toute la classe
+peut donc produire quelques PDF plutôt qu'un fichier par élève.
+Le GUI écrit =refaire.json= et guide ensuite le parcours ci-dessous.
+La vérification du découpage, le redécoupage et la recorrection peuvent
+être ignorés. Pour plusieurs copies, les vérifications et découpages
+s'exécutent successivement ; un échec ou une interruption arrête la suite.
+Ce parcours a sa propre progression : les boutons de navigation du
+passage principal ne l'ouvrent pas automatiquement. Après la fusion,
+les étapes de restitution déjà terminées sont marquées à revalider.
+
+Ce flux fonctionne après =annotate-grouped= (=BGnot=),
+=annotate-checks= (=Bnot=) ou =annotate-simple= (=Anot=).
+Terminer d'abord la lecture des annotations du passage principal
+(=read-grouped= ou =read-annotations= pour les modes à cases).
+Conserver les dossiers d'annotation et leurs fichiers de référence.
+
+ 1. Si nécessaire, reprendre le découpage :
+    + =python -m copienator review-labels Interro/Copies/Copie01.pdf=
+    + =python -m copienator split-answers Interro/Copies/Copie01.pdf=
+    Vérifier les réponses découpées avant de relancer la correction,
+    notamment les fichiers =_new= et =_old= issus de résolutions manuelles.
+ 2. Créer =Interro/refaire.json= :
     : [["Copie02", []],
     :  ["Copie01", ["Ex 1 : 1)"]]]
- 3. Appeler =correction= avec --refaire. Il doit créer des groupes
-    individuels, faire des requêtes, et remplacer les corrections
-    précédentes (à sauver ailleurs).
+    Une liste vide sélectionne toute la copie ; sinon donner les labels
+    exacts des questions (pas seulement le nom de l'exercice).
+ 3. =python -m copienator correct Interro --refaire=
+    Crée des groupes individuels et remplace les corrections sélectionnées.
+    Les anciennes corrections sont conservées dans =overwritten_correction.json=.
+    Cette étape peut être omise si les corrections sont modifiées à la main.
+ 4. Générer les PDF de vérification, selon la présentation souhaitée :
+    + Par question : =python -m copienator annotate-grouped Interro --refaire --overwrite=
+    + Par copie : =python -m copienator annotate-checks Interro --refaire --overwrite=
+    Les deux commandes produisent uniquement les réponses sélectionnées
+    dans =BRnot=, avec des cases à cocher, quel que soit le mode du passage
+    principal. Le mode groupé garde les identifiants des élèves et regroupe
+    les réponses par label sans demander de modifier =label_groups=.
+    Cela ne nécessite pas d'avoir généré =Bnot= ou =BGnot= auparavant.
+    Attention : =--overwrite= remplace tout le précédent passage dans
+    =BRnot=, y compris ses annotations manuscrites. Une génération incomplète
+    conserve l'ancien =BRnot=. Sans =--overwrite=, un =BRnot= existant est refusé.
+ 5. Vider les dossiers personnels d'export/import des anciens fichiers,
+    puis =python -m copienator export Interro --refaire=.
+    Annoter les PDF sur la tablette, puis placer les PDF retournés dans
+    =IMPORT_DIR= en conservant leur nom exporté (nom de groupe ou =Copie01.pdf=).
+    Même sans modification manuscrite, retourner le PDF pour valider ce passage.
+ 6. =python -m copienator import Interro --refaire=
+ 7. Fusionner dans le dossier du passage principal :
+    + Groupé : =python -m copienator read-grouped Interro --refaire=
+    + Cases : =python -m copienator read-grouped Interro --refaire --annotation-dir Bnot=
+    + Simple : =python -m copienator read-grouped Interro --refaire --annotation-dir Anot=
 
-    Ou non, si tu veux le faire à la main.
- 4. ?? Si je fais refaire, avant d'avoir créer les annotating with
-    checks, que se passe-t-il ???
- 5. Appeler =python -m copienator annotate-checks --refaire --overwrite=
- 6. =python -m copienator export --refaire Interro24=
- 6. =python -m copienator import --refaire Interro24=
- 7. =python -m copienator read-grouped --refaire Interro24=
+    Le lecteur reconnaît les retours par question comme les retours par
+    copie grâce aux métadonnées et réattribue les cases et notes à chaque
+    élève. Un groupe manquant laisse intactes les copies qui en dépendent.
+    Il reconstruit la copie complète, conserve les réponses non
+    sélectionnées et leurs scores, et remplace les réponses sélectionnées
+    par celles de =BRnot=. Dans la compilation filtrée, les images déjà
+    enregistrées des questions non sélectionnées sont conservées par
+    prudence, même si leur score est parfait, pour ne pas perdre de notes.
+    Les anciennes cases et notes manuscrites des
+    questions refaites sont remplacées. Les autres copies restent intactes.
+    En mode simple, une image =Concat_annotated.jpg= ou =.jpeg= importée
+    doit conserver les dimensions de l'image exportée ; les parties non
+    sélectionnées sont conservées. Le fichier =refaire_simple_layout.json=
+    mémorise le découpage de cette image pour les passages suivants.
 
-    Avec =--refaire=, =refaire.json= et le dossier =BRnot= sont des
-    prérequis obligatoires ; leur absence produit le code de sortie 3.
+    Les sorties finales (=Concat.jpg=, images par question, =score.json=
+    et compilation filtrée) sont mises à jour dans =BGnot=, =Bnot= ou
+    =Anot= ; les PDF et références du passage principal restent ceux de
+    ce passage. Pour une nouvelle retouche, reprendre ce flux =--refaire=,
+    sans relire ensuite les anciennes annotations avec le lecteur normal.
+    Relancer ensuite les étapes habituelles de calcul des notes et de diffusion.
 
-** Exemple de replotting, refaire d'une copie
-
- 1. replot it.
- 2. `python -m copienator split-answers DS09VA/Copies/Copie25.pdf`
-    this will get rid of old/new.
-    !! Attention, et si ça dégage un new : bad bad bad.
- 3. Make `refaire.json`, avec la copie, et les labels à refaire.
- 4. `python -m copienator correct DS09VA --refaire`
- 5. `python -m copienator annotate-checks DS09VA --refaire`
- 6. `python -m copienator import Interro24 --refaire`
+    =refaire.json=, =BRnot= et le dossier du passage principal sont
+    obligatoires (code de sortie 3 s'ils manquent). Une copie dont les
+    fichiers de retour sont incomplets est laissée intacte (code 4).
+    Ne pas ajouter =--update-score= sauf pour imposer volontairement les
+    anciens scores, y compris ceux des questions refaites.
diff --git a/copienator/annotation_data.py b/copienator/annotation_data.py
index 404e366..b7ce3ff 100644
--- a/copienator/annotation_data.py
+++ b/copienator/annotation_data.py
@@ -36,7 +36,12 @@ def _coordinate_index(
     if not workspace.groups_dir.is_dir():
         return index, [f"Group directory not found: {workspace.groups_dir}"]
 
-    for metadata_path in sorted(workspace.groups_dir.glob("*/Group_*.json")):
+    # A redo appends a new numbered group; its coordinates supersede the old group.
+    for metadata_path in sorted(
+        workspace.groups_dir.glob("*/Group_*.json"),
+        key=lambda path: int(path.stem.removeprefix("Group_")),
+        reverse=True,
+    ):
         image_path = metadata_path.with_suffix(".jpg")
         try:
             entries = read_json(metadata_path)
@@ -160,12 +165,16 @@ def load_annotation_data(
                 warnings.append(f"Ignoring malformed correction batch for {label!r}")
                 continue
             for item in raw_batch:
-                if not isinstance(item, dict) or not isinstance(item.get("result"), dict):
+                if not isinstance(item, dict) or not isinstance(
+                    item.get("result"), dict
+                ):
                     warnings.append(f"Ignoring malformed correction item for {label!r}")
                     continue
                 student_id = str(item.get("id", ""))
                 if not student_id:
-                    warnings.append(f"Ignoring correction item without an id for {label!r}")
+                    warnings.append(
+                        f"Ignoring correction item without an id for {label!r}"
+                    )
                     continue
                 result = item["result"]
                 suffix = str(result.get("suffix", ""))
diff --git a/copienator/commands/annotating_by_label.py b/copienator/commands/annotating_by_label.py
index 764afaa..2cdf1d6 100644
--- a/copienator/commands/annotating_by_label.py
+++ b/copienator/commands/annotating_by_label.py
@@ -10,9 +10,6 @@ from typing import Any
 from PIL import Image, ImageDraw
 from reportlab.pdfgen import canvas
 
-from copienator.commands import annotating
-from copienator.commands import annotating_with_checks
-from copienator import utils
 from copienator import (
     CliError,
     EvaluationWorkspace,
@@ -22,9 +19,11 @@ from copienator import (
     evaluation_parser,
     execute,
     read_json,
+    utils,
     workspace_from_args,
 )
 from copienator.annotation_data import load_annotation_data
+from copienator.commands import annotating, annotating_with_checks
 from copienator.filesystem import staged_directory
 from copienator.utils import natural_key
 
@@ -184,7 +183,9 @@ def _serialize_label_groups(groups: list[list[str]]) -> str:
     return "".join(",".join(group) + "\n" for group in groups)
 
 
-def _load_label_groups(workspace: EvaluationWorkspace, labels: list[str]) -> list[list[str]]:
+def _load_label_groups(
+    workspace: EvaluationWorkspace, labels: list[str]
+) -> list[list[str]]:
     label_groups = workspace.label_groups_file
     if not label_groups.exists():
         gemini_groups = _gemini_label_groups(workspace, labels)
@@ -328,20 +329,38 @@ def _generate_groups(
     return generated, problems
 
 
-def run(workspace: EvaluationWorkspace, *, overwrite: bool = False) -> ExitCode:
+def run(
+    workspace: EvaluationWorkspace, *, overwrite: bool = False, refaire: bool = False
+) -> ExitCode:
     workspace.require_files("labels", "correction.json")
     workspace.require_directories("Copies", "Par label")
     labels = utils.read_all_labels(workspace.root)
-    groups = _load_label_groups(workspace, labels)
-    loaded = load_annotation_data(workspace)
+    refaire_list = annotating_with_checks._load_refaire(workspace) if refaire else None
+    loaded = load_annotation_data(workspace, refaire_list=refaire_list)
+    groups = (
+        [
+            [label]
+            for label in sorted(
+                {label for answers in loaded.data.values() for label in answers},
+                key=natural_key,
+            )
+        ]
+        if refaire
+        else _load_label_groups(workspace, labels)
+    )
     for warning in loaded.warnings:
         print(f"Warning: {warning}")
     if not loaded.data:
         print("Warning: no annotation data was found.")
         return ExitCode.PARTIAL
 
-    output_root = workspace.annotation_dir("grouped")
-    if overwrite:
+    output_root = workspace.annotation_dir("refaire" if refaire else "grouped")
+    if refaire and output_root.exists() and not overwrite:
+        raise CliError(
+            "BRnot already exists; use --overwrite to replace the previous redo."
+        )
+    if overwrite or refaire:
+
         class IncompleteGroupedOutput(Exception):
             pass
 
@@ -356,7 +375,9 @@ def run(workspace: EvaluationWorkspace, *, overwrite: bool = False) -> ExitCode:
                 if generated == 0 or problems or loaded.warnings:
                     raise IncompleteGroupedOutput
         except IncompleteGroupedOutput:
-            print("Warning: grouped overwrite was incomplete; previous BGnot was preserved.")
+            print(
+                f"Warning: grouped overwrite was incomplete; previous {output_root.name} was preserved."
+            )
             return ExitCode.PARTIAL
     else:
         output_root.mkdir(parents=True, exist_ok=True)
@@ -375,7 +396,14 @@ def run(workspace: EvaluationWorkspace, *, overwrite: bool = False) -> ExitCode:
 
 def build_parser() -> argparse.ArgumentParser:
     parser = evaluation_parser("Generate annotated PDFs grouped by labels.")
-    parser.add_argument("--overwrite", action="store_true", help="Replace BGnot safely")
+    parser.add_argument(
+        "--overwrite", action="store_true", help="Replace annotation outputs safely"
+    )
+    parser.add_argument(
+        "--refaire",
+        action="store_true",
+        help="Group only the answers in refaire.json, writing to BRnot",
+    )
     return parser
 
 
@@ -384,7 +412,9 @@ def main(argv: Sequence[str] | None = None) -> int:
     return execute(
         parser,
         argv,
-        lambda args: run(workspace_from_args(args), overwrite=args.overwrite),
+        lambda args: run(
+            workspace_from_args(args), overwrite=args.overwrite, refaire=args.refaire
+        ),
     )
 
 
diff --git a/copienator/commands/annotating_with_checks.py b/copienator/commands/annotating_with_checks.py
index 43b7436..b13a37c 100644
--- a/copienator/commands/annotating_with_checks.py
+++ b/copienator/commands/annotating_with_checks.py
@@ -14,8 +14,6 @@ matplotlib.use("Agg")
 from PIL import Image, ImageFont
 from reportlab.pdfgen import canvas
 
-from copienator.commands import annotating
-from copienator import utils
 from copienator import (
     CliError,
     EvaluationWorkspace,
@@ -24,9 +22,11 @@ from copienator import (
     execute,
     read_json,
     target_parser,
+    utils,
     workspace_from_target,
 )
 from copienator.annotation_data import load_annotation_data
+from copienator.commands import annotating
 from copienator.filesystem import staged_directory
 from copienator.utils import natural_key
 
@@ -46,7 +46,9 @@ except OSError:
 
 def draw_checkbox(draw, x, y, size=BOX_SIZE, label=None, fill="white"):
     if label:
-        draw.text((x - BOX_SIZE - 5, y + 2), str(label), fill="black", font=CHECKBOX_FONT)
+        draw.text(
+            (x - BOX_SIZE - 5, y + 2), str(label), fill="black", font=CHECKBOX_FONT
+        )
     draw.rectangle([x, y, x + size, y + size], fill=fill, outline="black", width=2)
     return [x, y, x + size, y + size]
 
@@ -150,8 +152,13 @@ def _render_student(
     *,
     overwrite: bool,
     output_mode: str,
+    output_root: Path | None = None,
 ) -> str:
-    output_dir = workspace.annotation_dir(output_mode) / f"Copie{student_id}"
+    output_dir = (
+        output_root
+        if output_root is not None
+        else workspace.annotation_dir(output_mode)
+    ) / f"Copie{student_id}"
     if _output_complete(output_dir) and not overwrite:
         print(f"Skipping {student_id}: output is complete.")
         return "skipped"
@@ -178,6 +185,7 @@ def _render_student(
             draw_callback=checkbox_renderer.callback,
         )
         if final_image is None:
+            problems = True
             continue
         label_images.append(final_image)
         checkbox_groups.append(checkbox_renderer.checkboxes)
@@ -280,6 +288,39 @@ def run(
 
     output_mode = "refaire" if refaire else "checks"
     tasks = sorted(loaded.data.items(), key=lambda item: natural_key(item[0]))
+    if refaire:
+        output_root = workspace.annotation_dir("refaire")
+        if output_root.exists() and not overwrite:
+            raise CliError(
+                "BRnot already exists; use --overwrite to replace the previous redo."
+            )
+
+        class IncompleteRedo(Exception):
+            pass
+
+        try:
+            with staged_directory(output_root) as staging:
+                with concurrent.futures.ThreadPoolExecutor(max_workers=2) as executor:
+                    futures = [
+                        executor.submit(
+                            _render_student,
+                            workspace,
+                            student_id,
+                            labels,
+                            overwrite=True,
+                            output_mode="refaire",
+                            output_root=staging,
+                        )
+                        for student_id, labels in tasks
+                    ]
+                    statuses = [future.result() for future in futures]
+                if loaded.warnings or any(status != "success" for status in statuses):
+                    raise IncompleteRedo
+        except IncompleteRedo:
+            print("Warning: incomplete redo generation; previous BRnot was preserved.")
+            return ExitCode.PARTIAL
+        return ExitCode.SUCCESS
+
     statuses: list[str] = []
     with concurrent.futures.ThreadPoolExecutor(max_workers=2) as executor:
         futures = [
@@ -302,7 +343,9 @@ def run(
 
 def build_parser() -> argparse.ArgumentParser:
     parser = target_parser("Generate annotated PDFs with checkboxes.")
-    parser.add_argument("--overwrite", action="store_true", help="Replace existing outputs")
+    parser.add_argument(
+        "--overwrite", action="store_true", help="Replace existing outputs"
+    )
     parser.add_argument(
         "--refaire",
         action="store_true",
@@ -328,4 +371,3 @@ def main(argv: Sequence[str] | None = None) -> int:
 
 if __name__ == "__main__":
     raise SystemExit(main())
-
diff --git a/copienator/commands/reading_grouped_annotations.py b/copienator/commands/reading_grouped_annotations.py
index f22c572..a66ffd2 100644
--- a/copienator/commands/reading_grouped_annotations.py
+++ b/copienator/commands/reading_grouped_annotations.py
@@ -9,8 +9,6 @@ from typing import Any
 
 from PIL import Image, ImageDraw
 
-from copienator.commands import annotating
-from copienator import utils
 from copienator import (
     EvaluationWorkspace,
     ExitCode,
@@ -18,16 +16,18 @@ from copienator import (
     evaluation_parser,
     execute,
     read_json,
+    utils,
     workspace_from_args,
 )
 from copienator.annotation_actions import apply_checkbox_actions, apply_score_overrides
 from copienator.annotation_data import AnnotationData, RefaireList, load_annotation_data
-from copienator.filesystem import staged_files
+from copienator.commands import annotating
 from copienator.commands.reading_annotations import (
     concatenate,
     detect_checks_and_notes,
     has_significant_notes,
 )
+from copienator.filesystem import staged_files
 
 LabelNotes = dict[str, dict[str, Any]]
 ScanResult = tuple[dict[str, list[dict[str, Any]]], dict[str, LabelNotes]]
@@ -54,7 +54,9 @@ def get_extra_pdfs_as_images(
     return images
 
 
-def save_paginated_pdf(image_groups: list[list[Image.Image]], output_path: Path) -> None:
+def save_paginated_pdf(
+    image_groups: list[list[Image.Image]], output_path: Path
+) -> None:
     """Paginate vertically concatenated image groups and save them as a PDF."""
     non_empty = [group for group in image_groups if group]
     if not non_empty:
@@ -118,6 +120,8 @@ def _scan_annotation_directory(
     directory: Path,
     only_ids: set[str] | None = None,
     default_student_id: str | None = None,
+    *,
+    required: bool = False,
 ) -> ScanResult:
     bnote_path = directory / "bnote.json"
     if not bnote_path.is_file():
@@ -133,6 +137,8 @@ def _scan_annotation_directory(
 
     actions, notes_image = detect_checks_and_notes(directory)
     if notes_image is None:
+        if required:
+            raise ValueError(f"Could not read annotations in {directory}")
         return {}, {}
     actions_by_student: dict[str, list[dict[str, Any]]] = defaultdict(list)
     notes_by_student: dict[str, LabelNotes] = defaultdict(dict)
@@ -176,10 +182,12 @@ def apply_actions_and_regenerate_grouped(
     all_labels: list[str],
     *,
     update_score: bool = False,
+    annotation_dir: str = "BGnot",
+    selected_labels: set[str] | None = None,
 ) -> tuple[ExitCode, str]:
-    """Apply grouped annotations and atomically merge regenerated student files."""
+    """Regenerate a copy, preserving reviewed images outside the redo selection."""
     logs = [f"\nProcessing compilation for: Copie{student_id}"]
-    output_dir = workspace.annotation_dir("grouped") / f"Copie{student_id}"
+    output_dir = workspace.root / annotation_dir / f"Copie{student_id}"
     labels_data = data.get(student_id, {})
     dirty_labels = apply_checkbox_actions(labels_data, actions, logs.append)
     if update_score:
@@ -187,15 +195,91 @@ def apply_actions_and_regenerate_grouped(
             labels_data, output_dir / "score.json", logs.append
         )
 
+    selected_labels = selected_labels if selected_labels is not None else set()
+    dirty_labels |= selected_labels
+    simple_layout = None
+    simple_annotated = None
+    if selected_labels and annotation_dir == "Anot":
+        imported = next(
+            (
+                output_dir / name
+                for name in ("Concat_annotated.jpg", "Concat_annotated.jpeg")
+                if (output_dir / name).is_file()
+            ),
+            None,
+        )
+        if imported is not None:
+            layout_path = output_dir / "refaire_simple_layout.json"
+            if layout_path.is_file():
+                simple_layout = read_json(layout_path)
+            else:
+                simple_layout = {"images": {}, "replaced": []}
+                y = 0
+                for label in sorted(labels_data, key=utils.natural_key):
+                    path = output_dir / f"{label}.jpg"
+                    if (
+                        path.is_file()
+                        and labels_data[label]["result"].get("error") != "empty-answer"
+                    ):
+                        with Image.open(path) as saved:
+                            simple_layout["images"][label] = [y, y + saved.height]
+                            y += saved.height
+            with Image.open(imported) as saved:
+                simple_annotated = saved.convert("RGB").copy()
+            expected_height = max(
+                (bounds[1] for bounds in simple_layout["images"].values()), default=0
+            )
+            if simple_annotated.height != expected_height:
+                raise ValueError(
+                    "Imported simple image height does not match the original copy layout"
+                )
+    old_scores = (
+        read_json(output_dir / "score.json")
+        if selected_labels and (output_dir / "score.json").is_file()
+        else {}
+    )
     scores = dict.fromkeys(all_labels, "")
     dirty_images: dict[str, Image.Image] = {}
     concat_images: list[Image.Image] = []
     filtered_groups: list[list[Image.Image]] = []
     incomplete = False
 
-    for label, content in sorted(labels_data.items(), key=lambda item: utils.natural_key(item[0])):
+    for label, content in sorted(
+        labels_data.items(), key=lambda item: utils.natural_key(item[0])
+    ):
         result = content["result"]
+        if (
+            selected_labels
+            and label not in selected_labels
+            and old_scores.get(label, "") != ""
+        ):
+            result["score"] = old_scores[label]
         scores[label] = str(result.get("score", 0))
+        saved_image = output_dir / f"{label}.jpg"
+        if selected_labels and label not in selected_labels and saved_image.is_file():
+            with Image.open(saved_image) as saved:
+                final_image = saved.convert("RGB").copy()
+            if (
+                simple_annotated is not None
+                and label in simple_layout["images"]
+                and label not in simple_layout["replaced"]
+            ):
+                hmin, hmax = simple_layout["images"][label]
+                final_image = simple_annotated.crop(
+                    (0, hmin, simple_annotated.width, hmax)
+                )
+                dirty_images[label] = final_image
+            scores[label] = str(old_scores.get(label, scores[label]))
+            concat_images.append(final_image)
+            # Keep previously reviewed content, including handwriting.
+            if annotation_dir == "BGnot":
+                extras = get_extra_pdfs_as_images(
+                    workspace.root, label, annotating, all_labels
+                )
+                filtered_groups.append([*extras, final_image])
+            else:
+                filtered_groups.append([final_image])
+            continue
         pdf_path = Path(content["pdf_path"])
         if not pdf_path.is_file():
             logs.append(f"  Missing answer PDF: {pdf_path}")
@@ -221,13 +305,15 @@ def apply_actions_and_regenerate_grouped(
             if has_notes:
                 width, height = sub_note.size
                 if old_header_height > 0:
-                    header = sub_note.crop((0, 0, width, min(height, old_header_height)))
+                    header = sub_note.crop(
+                        (0, 0, width, min(height, old_header_height))
+                    )
                     final_image.paste(header, (0, 0), mask=header)
                 if height > old_header_height:
                     body = sub_note.crop((0, old_header_height, width, height))
                     final_image.paste(body, (0, new_header_height), mask=body)
 
-        if label in dirty_labels or has_notes:
+        if label in dirty_labels or has_notes or selected_labels:
             dirty_images[label] = final_image
             logs.append(f"  Saved dirty image: {label}.jpg")
         concat_images.append(final_image)
@@ -237,33 +323,54 @@ def apply_actions_and_regenerate_grouped(
             feedback.get("to_delete", False) for feedback in feedbacks
         )
         if not perfect or has_notes:
-            extras = get_extra_pdfs_as_images(
-                workspace.root, label, annotating, all_labels
+            extras = (
+                get_extra_pdfs_as_images(workspace.root, label, annotating, all_labels)
+                if annotation_dir == "BGnot"
+                else []
             )
             filtered_groups.append([*extras, final_image])
 
     concat_image = concatenate(concat_images)
-    with staged_files(output_dir) as staging:
+    if incomplete:
+        return ExitCode.PARTIAL, "\n".join(logs)
+    with staged_files(output_dir, remove=("Concat_F.pdf", "Concat_F.jpg")) as staging:
+        if simple_layout is not None:
+            simple_layout["replaced"] = sorted(
+                set(simple_layout["replaced"]) | selected_labels
+            )
+            atomic_write_json(staging / "refaire_simple_layout.json", simple_layout)
         for label, image in dirty_images.items():
             image.save(staging / f"{label}.jpg")
         atomic_write_json(staging / "score.json", scores)
         if concat_image is not None:
             concat_image.save(staging / "Concat.jpg")
         if filtered_groups:
-            save_paginated_pdf(filtered_groups, staging / "Concat_F.pdf")
+            if annotation_dir == "BGnot":
+                save_paginated_pdf(filtered_groups, staging / "Concat_F.pdf")
+            else:
+                filtered_image = concatenate(
+                    [image for group in filtered_groups for image in group]
+                )
+                filtered_image.save(staging / "Concat_F.jpg")
     logs.append(f"  Saved regenerated files in {output_dir}")
     status = ExitCode.PARTIAL if incomplete else ExitCode.SUCCESS
     return status, "\n".join(logs)
 
 
-def _read_refaire(workspace: EvaluationWorkspace) -> tuple[RefaireList, dict[str, list[str]]]:
+def _read_refaire(
+    workspace: EvaluationWorkspace,
+) -> tuple[RefaireList, dict[str, list[str]]]:
     loaded = read_json(workspace.refaire_file)
     if not isinstance(loaded, list):
         raise TypeError("refaire.json must contain a JSON array")
     entries: RefaireList = []
     by_student: dict[str, list[str]] = {}
     for entry in loaded:
-        if not isinstance(entry, list) or len(entry) != 2 or not isinstance(entry[1], list):
+        if (
+            not isinstance(entry, list)
+            or len(entry) != 2
+            or not isinstance(entry[1], list)
+        ):
             raise TypeError(f"Malformed refaire entry: {entry!r}")
         copy_name, labels = entry
         student_id = str(copy_name).removeprefix("Copie")
@@ -273,14 +380,78 @@ def _read_refaire(workspace: EvaluationWorkspace) -> tuple[RefaireList, dict[str
     return entries, by_student
 
 
+def _scan_redo_annotations(
+    directory: Path,
+    expected: dict[str, set[str]],
+) -> tuple[dict[str, list[dict[str, Any]]], dict[str, LabelNotes], set[str]]:
+    """Read either grouped or per-copy redo PDFs using their student/label metadata."""
+    actions: dict[str, list[dict[str, Any]]] = defaultdict(list)
+    notes: dict[str, LabelNotes] = defaultdict(dict)
+    seen: dict[str, set[str]] = defaultdict(set)
+    incomplete: set[str] = set()
+    plans = []
+    required = ("checkboxes.json", "Reference.jpg", "Concat_annotated.pdf")
+    for path in sorted(directory.iterdir()):
+        if not path.is_dir():
+            continue
+        default_id = (
+            path.name.removeprefix("Copie") if path.name.startswith("Copie") else None
+        )
+        try:
+            metadata = read_json(path / "bnote.json")
+            pairs = [
+                (str(item.get("id", default_id)), str(item["label"]))
+                for item in metadata["images"]
+            ]
+        except (OSError, ValueError, TypeError, KeyError) as exc:
+            print(f"Warning: unreadable redo metadata in {path}: {exc}")
+            incomplete.update(expected)
+            continue
+        students = {
+            student_id for student_id, _label in pairs if student_id in expected
+        }
+        if not students:
+            continue
+        for student_id, label in pairs:
+            if student_id not in expected:
+                continue
+            if label in seen[student_id]:
+                incomplete.add(student_id)
+            seen[student_id].add(label)
+        if any(not (path / name).is_file() for name in required):
+            print(f"Warning: missing returned redo inputs in {path}")
+            incomplete.update(students)
+        else:
+            plans.append((path, default_id, students))
+    for student_id, labels in expected.items():
+        if seen[student_id] != labels:
+            print(
+                f"Warning: redo labels do not match refaire.json for Copie{student_id}; regenerate BRnot"
+            )
+            incomplete.add(student_id)
+    for path, default_id, students in plans:
+        if students <= incomplete:
+            continue
+        try:
+            result = _scan_annotation_directory(
+                path, default_student_id=default_id, required=True
+            )
+            _merge_scan_result(actions, notes, result)
+        except (OSError, ValueError, TypeError) as exc:
+            print(f"Warning: could not read redo annotations in {path}: {exc}")
+            incomplete.update(students)
+    return dict(actions), dict(notes), incomplete
+
+
 def run(
     workspace: EvaluationWorkspace,
     *,
     refaire: bool = False,
     update_score: bool = False,
+    annotation_dir: str = "BGnot",
 ) -> ExitCode:
     workspace.require_files("labels", "correction.json")
-    workspace.require_directories("Copies", "Par label", "BGnot")
+    workspace.require_directories("Copies", "Par label", annotation_dir)
     refaire_list: RefaireList | None = None
     refaire_by_student: dict[str, list[str]] = {}
     if refaire:
@@ -289,7 +460,12 @@ def run(
         refaire_list, refaire_by_student = _read_refaire(workspace)
 
     all_labels = utils.read_all_labels(workspace.root)
-    loaded = load_annotation_data(workspace, refaire_list=refaire_list)
+    loaded = load_annotation_data(workspace)
+    if refaire_list:
+        # Add explicitly requested answers without filtering out the rest of a copy.
+        selected_data = load_annotation_data(workspace, refaire_list=refaire_list)
+        for student_id, labels in selected_data.data.items():
+            loaded.data.setdefault(student_id, {}).update(labels)
     for warning in loaded.warnings:
         print(f"Warning: {warning}")
     if not loaded.data:
@@ -301,8 +477,10 @@ def run(
     only_ids = set(refaire_by_student) or None
     group_dirs = [
         path
-        for path in workspace.annotation_dir("grouped").iterdir()
-        if path.is_dir() and not path.name.startswith("Copie")
+        for path in (workspace.root / annotation_dir).iterdir()
+        if annotation_dir == "BGnot"
+        and path.is_dir()
+        and not path.name.startswith("Copie")
     ]
     with concurrent.futures.ThreadPoolExecutor(max_workers=6) as executor:
         futures = [
@@ -312,39 +490,58 @@ def run(
         for future in concurrent.futures.as_completed(futures):
             _merge_scan_result(actions_by_student, notes_by_student, future.result())
 
-    refaire_incomplete = False
+    if annotation_dir == "Bnot":
+        for student_id in refaire_by_student:
+            directory = workspace.root / annotation_dir / f"Copie{student_id}"
+            if directory.is_dir():
+                _merge_scan_result(
+                    actions_by_student,
+                    notes_by_student,
+                    _scan_annotation_directory(
+                        directory, default_student_id=student_id
+                    ),
+                )
+
+    skipped_students: set[str] = set()
     if refaire:
-        for student_id, requested_labels in refaire_by_student.items():
-            selected = requested_labels or list(loaded.data.get(student_id, {}))
-            selected_set = set(selected)
-            directory = workspace.annotation_dir("refaire") / f"Copie{student_id}"
-            if not directory.is_dir():
-                print(f"Warning: missing refaire annotation directory {directory}")
-                refaire_incomplete = True
+        expected = {
+            student_id: set(labels or loaded.data.get(student_id, {}))
+            for student_id, labels in refaire_by_student.items()
+        }
+        redo_actions, redo_notes, skipped_students = _scan_redo_annotations(
+            workspace.annotation_dir("refaire"), expected
+        )
+        for student_id, selected in expected.items():
+            if student_id in skipped_students:
                 continue
             actions_by_student[student_id] = [
                 action
                 for action in actions_by_student[student_id]
-                if str(action.get("label")) not in selected_set
+                if str(action.get("label")) not in selected
             ]
             for label in selected:
                 notes_by_student[student_id].pop(label, None)
-            refaire_actions, refaire_notes = _scan_annotation_directory(
-                directory, default_student_id=student_id
+            actions_by_student[student_id].extend(
+                action
+                for action in redo_actions.get(student_id, [])
+                if str(action.get("label")) in selected
+            )
+            notes_by_student[student_id].update(
+                {
+                    label: note
+                    for label, note in redo_notes.get(student_id, {}).items()
+                    if label in selected
+                }
             )
-            for action in refaire_actions.get(student_id, []):
-                if str(action.get("label")) in selected_set:
-                    actions_by_student[student_id].append(action)
-            for label, note in refaire_notes.get(student_id, {}).items():
-                if label in selected_set:
-                    notes_by_student[student_id][label] = note
 
     status = (
-        ExitCode.PARTIAL
-        if loaded.warnings or refaire_incomplete
-        else ExitCode.SUCCESS
+        ExitCode.PARTIAL if loaded.warnings or skipped_students else ExitCode.SUCCESS
+    )
+    student_ids = (
+        list(refaire_by_student)
+        if refaire
+        else sorted(loaded.data, key=utils.natural_key)
     )
-    student_ids = list(refaire_by_student) if refaire else sorted(loaded.data, key=utils.natural_key)
     with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
         futures = {
             executor.submit(
@@ -356,9 +553,15 @@ def run(
                 notes_by_student[student_id],
                 all_labels,
                 update_score=update_score,
+                annotation_dir=annotation_dir,
+                selected_labels=(
+                    set(refaire_by_student[student_id] or loaded.data[student_id])
+                    if refaire
+                    else None
+                ),
             ): student_id
             for student_id in student_ids
-            if student_id in loaded.data
+            if student_id in loaded.data and student_id not in skipped_students
         }
         for future in concurrent.futures.as_completed(futures):
             result, output = future.result()
@@ -370,6 +573,12 @@ def run(
 
 def build_parser() -> argparse.ArgumentParser:
     parser = evaluation_parser("Read grouped annotations and regenerate copies")
+    parser.add_argument(
+        "--annotation-dir",
+        choices=("BGnot", "Bnot", "Anot"),
+        default="BGnot",
+        help="Original annotation directory for --refaire (default: BGnot)",
+    )
     parser.add_argument(
         "--refaire",
         action="store_true",
@@ -387,10 +596,13 @@ def main(argv: Sequence[str] | None = None) -> int:
     parser = build_parser()
 
     def handle(args: argparse.Namespace) -> ExitCode:
+        if args.annotation_dir != "BGnot" and not args.refaire:
+            parser.error("--annotation-dir requires --refaire")
         return run(
             workspace_from_args(args),
             refaire=args.refaire,
             update_score=args.update_score,
+            annotation_dir=args.annotation_dir,
         )
 
     return execute(parser, argv, handle)
@@ -398,4 +610,3 @@ def main(argv: Sequence[str] | None = None) -> int:
 
 if __name__ == "__main__":
     raise SystemExit(main())
-
diff --git a/copienator_gui/app.py b/copienator_gui/app.py
index f0fd8fc..6351473 100644
--- a/copienator_gui/app.py
+++ b/copienator_gui/app.py
@@ -3,11 +3,12 @@ from __future__ import annotations
 import os
 import queue
 import tkinter as tk
+from dataclasses import replace
 from pathlib import Path
 from tkinter import filedialog, messagebox, ttk
 from typing import Any
 
-from copienator import ExitCode
+from copienator import EvaluationWorkspace, ExitCode, atomic_write_json
 from copienator.platform import (
     WindowsLabelError,
     add_platform_executable_paths,
@@ -16,6 +17,14 @@ from copienator.platform import (
 )
 
 from .diagnostics import collect_diagnostics
+from .refaire import SECTION as REFAIRE_SECTION
+from .refaire import (
+    RefaireSelection,
+    available_copies,
+    load_selection,
+    resolve_layout,
+    validate_selection,
+)
 from .runner import ProcessRunner
 from .state import StateStore
 from .workflow import (
@@ -154,6 +163,9 @@ class CopienatorApp(tk.Tk):
         self.arg_vars: dict[str, tk.Variable] = {}
         self.copy_paths: dict[str, Path] = {}
         self._rendering = False
+        self.refaire_panel: RefaireSelection | None = None
+        self.pending_refaire_commands: list[list[str]] = []
+        self.refaire_command_index = 0
 
         self.title("Copienator — assistant de correction")
         self.geometry("1180x820")
@@ -245,8 +257,19 @@ class CopienatorApp(tk.Tk):
         self.title_label.grid(row=0, column=0, sticky="w")
         self.description_label = ttk.Label(self.detail, text="", wraplength=680, justify="left")
         self.description_label.grid(row=1, column=0, sticky="ew", pady=(5, 8))
-        self.form = ttk.Frame(self.detail)
-        self.form.grid(row=2, column=0, sticky="nsew")
+        form_container = ttk.Frame(self.detail)
+        form_container.grid(row=2, column=0, sticky="nsew")
+        form_container.columnconfigure(0, weight=1)
+        form_container.rowconfigure(0, weight=1)
+        self.form_canvas = tk.Canvas(form_container, highlightthickness=0, width=1, height=1)
+        self.form_canvas.grid(row=0, column=0, sticky="nsew")
+        form_scroll = ttk.Scrollbar(form_container, orient="vertical", command=self.form_canvas.yview)
+        form_scroll.grid(row=0, column=1, sticky="ns")
+        self.form_canvas.configure(yscrollcommand=form_scroll.set)
+        self.form = ttk.Frame(self.form_canvas)
+        form_window = self.form_canvas.create_window((0, 0), window=self.form, anchor="nw")
+        self.form.bind("<Configure>", lambda _event: self.form_canvas.configure(scrollregion=self.form_canvas.bbox("all")))
+        self.form_canvas.bind("<Configure>", lambda event: self.form_canvas.itemconfigure(form_window, width=event.width))
         self.form.columnconfigure(1, weight=1)
 
         command_box = ttk.LabelFrame(self.detail, text="Commande", padding=6)
@@ -362,6 +385,9 @@ class CopienatorApp(tk.Tk):
         self.proxy_entry.configure(state="normal" if self.use_proxy_var.get() else "disabled")
 
     def _load_evaluation(self) -> None:
+        if self.active_step_id or self.runner.running:
+            messagebox.showinfo("Traitement en cours", "Attendez la fin du traitement avant de changer d’évaluation.")
+            return
         evaluation = self.evaluation
         if not evaluation or not evaluation.is_dir():
             messagebox.showerror("Dossier invalide", "Choisissez un dossier d’évaluation existant.")
@@ -392,13 +418,14 @@ class CopienatorApp(tk.Tk):
 
     def _populate_tree(self) -> None:
         selected = self.current_step.id if self.current_step else None
+        opened = {self.tree.item(item, "text"): self.tree.item(item, "open") for item in self.tree.get_children()}
         self.tree.delete(*self.tree.get_children())
         section_items: dict[str, str] = {}
         for step in self.steps:
             if step.section not in section_items:
                 section_id = f"section:{len(section_items)}"
                 section_items[step.section] = section_id
-                self.tree.insert("", "end", iid=section_id, text=step.section, values=("",), open=True)
+                self.tree.insert("", "end", iid=section_id, text=step.section, values=("",), open=opened.get(step.section, step.section != REFAIRE_SECTION))
             status = self._step_status(step)
             suffix = " (facultative)" if step.optional else ""
             self.tree.insert(
@@ -513,9 +540,16 @@ class CopienatorApp(tk.Tk):
         if not step:
             return
         self._rendering = True
+        redo = step.section == REFAIRE_SECTION
+        self.console.configure(height=8 if redo else 14)
+        self.rowconfigure(1, weight=4 if redo else 3)
+        self.rowconfigure(2, weight=1 if redo else 2)
+        self.form_canvas.configure(height=(340 if step.id == "refaire_selection" else 260) if redo else 200)
+        self.form_canvas.yview_moveto(0)
         for child in self.form.winfo_children():
             child.destroy()
         self.arg_vars.clear()
+        self.refaire_panel = None
         entry = self.state_store.step(step.id) if self.state_store.evaluation else {}
         saved_variant = entry.get("variant", step.variants[0].id)
         if saved_variant not in {variant.id for variant in step.variants}:
@@ -544,6 +578,8 @@ class CopienatorApp(tk.Tk):
         variant = self._current_variant()
         evaluation_arg = self._evaluation_arg()
         for spec in step.arguments:
+            if step.section == REFAIRE_SECTION:
+                continue
             if spec.variants and variant.id not in spec.variants:
                 continue
             value = values.get(spec.name, value_for_default(spec.default, evaluation_arg))
@@ -582,27 +618,44 @@ class CopienatorApp(tk.Tk):
                 row += 1
             row += 1
 
-        if not step.is_manual:
+        if not step.is_manual and step.section != REFAIRE_SECTION:
             ttk.Label(self.form, text="Arguments supplémentaires").grid(
                 row=row, column=0, sticky="w", pady=(10, 4), padx=(0, 8)
             )
             ttk.Entry(self.form, textvariable=self.extra_var).grid(row=row, column=1, sticky="ew", pady=(10, 4))
 
-        self.run_button.configure(text="Marquer terminée" if step.is_manual else "Exécuter")
+        self.run_button.configure(text="Enregistrer la sélection" if step.id == "refaire_selection" else ("Marquer terminée" if step.is_manual else "Exécuter"))
         self.skip_button.configure(state="normal" if step.optional else "disabled")
         self._rendering = False
         self._update_command_preview()
         self._update_controls()
 
     def _render_context_controls(self, step: StepDefinition, row: int) -> int:
-        if step.id == "review_persp":
-            ttk.Button(
-                self.form,
-                text="Ouvrir le dossier Persp",
-                command=self._open_persp,
-            ).grid(row=row, column=0, columnspan=2, sticky="w", pady=(0, 8))
-            row += 1
-
+        if step.section == REFAIRE_SECTION:
+            evaluation = self.evaluation
+            if step.id in {"refaire_selection", "refaire_correct"}:
+                row = self._correction_folder_buttons(row)
+            if step.id == "refaire_selection" and evaluation:
+                choices, preferred = self._annotation_directory_choices("export")
+                draft = self.state_store.step(step.id).get("values", {})
+                self.refaire_panel = RefaireSelection(self.form, evaluation, draft, choices, preferred)
+                self.refaire_panel.grid(row=row, column=0, columnspan=2, sticky="nsew")
+            else:
+                try:
+                    entries = self._refaire_selection()
+                    summary = f"{len(entries)} copie(s) sélectionnée(s) :\n" + " ; ".join(f"{name} : {', '.join(labels) or 'toute la copie'}" for name, labels in entries[:5])
+                    if len(entries) > 5:
+                        summary += f" ; et {len(entries) - 5} autres (voir la sélection)."
+                    source = self.state_store.step("refaire_selection").get("values", {}).get("annotation_dir", "")
+                    choice = self.state_store.step("refaire_selection").get("values", {}).get("layout", "auto")
+                    layout = resolve_layout(entries, EvaluationWorkspace(evaluation).read_labels(), choice)
+                    summary += f"\nPassage principal : {source} — PDF à vérifier : {'par question' if layout == 'grouped' else 'par copie'}"
+                except (OSError, ValueError, TypeError) as exc:
+                    summary = str(exc)
+                ttk.Label(self.form, text=summary, wraplength=600, justify="left").grid(row=row, column=0, columnspan=2, sticky="w")
+            return row + 1
+        if step.id in {"review_persp", "correction"}:
+            row = self._correction_folder_buttons(row)
         if step.section == "Prétraitement des copies":
             evaluation = self.evaluation
             paths = copy_pdf_paths(evaluation) if evaluation else []
@@ -646,6 +699,14 @@ class CopienatorApp(tk.Tk):
             row += 1
         return row
 
+    def _correction_folder_buttons(self, row: int) -> int:
+        buttons = ttk.Frame(self.form)
+        buttons.grid(row=row, column=0, columnspan=2, sticky="w", pady=(0, 6))
+        for directory, label in (("Sol", "Corrigés (Sol)"), ("Persp", "Consignes de notation (Persp)")):
+            ttk.Button(buttons, text=label,
+                       command=lambda name=directory: self._open_desktop_path(self.evaluation / name if self.evaluation else None, f"dossier {name}")).pack(side="left", padx=(0, 6))
+        return row + 1
+
     def _annotation_directory_choices(self, step_id: str) -> tuple[tuple[str, ...], str]:
         evaluation = self.evaluation
         detected = detected_annotation_directories(evaluation) if evaluation else ()
@@ -696,6 +757,10 @@ class CopienatorApp(tk.Tk):
         return next((variant for variant in self.current_step.variants if variant.id == selected), self.current_step.variants[0])
 
     def _values(self) -> dict[str, object]:
+        if self.current_step and self.current_step.section == REFAIRE_SECTION:
+            if self.current_step.id == "refaire_selection" and self.refaire_panel:
+                return self.refaire_panel.values()
+            return {"target": self._evaluation_arg(), "annotation_dir": self.state_store.step("refaire_selection").get("values", {}).get("annotation_dir", "BGnot")}
         return {name: variable.get() for name, variable in self.arg_vars.items()}
 
     def _save_current_form(self) -> None:
@@ -715,9 +780,62 @@ class CopienatorApp(tk.Tk):
         evaluation = self.evaluation
         return evaluation_argument(self.repository, evaluation) if evaluation else "<évaluation>"
 
+    def _progression_ids(self, step_id: str) -> list[str]:
+        redo = step_id.startswith("refaire_")
+        return [step.id for step in self.steps if step.id.startswith("refaire_") == redo]
+
+    def _refaire_selection(self) -> list[list]:
+        evaluation = self.evaluation
+        if not evaluation or not self.state_store.evaluation:
+            raise ValueError("Chargez d’abord une évaluation.")
+        entry = self.state_store.step("refaire_selection")
+        if entry.get("status") != "success":
+            raise ValueError("Enregistrez d’abord les copies et les questions à refaire.")
+        values = entry.get("values", {})
+        selection = load_selection(evaluation)
+        if selection != validate_selection(values.get("selection"), available_copies(evaluation), EvaluationWorkspace(evaluation).read_labels()):
+            raise ValueError("La sélection a changé. Enregistrez-la avant de continuer.")
+        source = values.get("annotation_dir")
+        if source not in ANNOTATION_DIRECTORIES or not (evaluation / source).is_dir():
+            raise ValueError("Choisissez un dossier existant pour le passage principal.")
+        return selection
+
+    def _save_refaire_selection(self) -> None:
+        if not self.refaire_panel or not self.evaluation:
+            return
+        try:
+            values = self.refaire_panel.values()
+            entries = validate_selection(values["selection"], available_copies(self.evaluation), EvaluationWorkspace(self.evaluation).read_labels())
+            source = values["annotation_dir"]
+            if source not in detected_annotation_directories(self.evaluation):
+                raise ValueError("Choisissez un dossier existant pour le passage principal.")
+            atomic_write_json(self.evaluation / "refaire.json", entries)
+            self._mark_step("success")
+            self._move_selection_from("refaire_selection", 1)
+        except (OSError, ValueError, TypeError) as exc:
+            messagebox.showerror("Sélection à vérifier", str(exc))
+
+    def _refaire_commands(self) -> list[list[str]]:
+        assert self.current_step is not None
+        selection = self._refaire_selection()
+        values = self._values()
+        targets = [self._evaluation_arg()]
+        if self.current_step.id in {"refaire_review", "refaire_split"}:
+            copies = available_copies(self.evaluation)
+            targets = [str(copies[name]) for name, _labels in selection]
+        variant = self._current_variant()
+        if self.current_step.id == "refaire_annotate":
+            choice = self.state_store.step("refaire_selection").get("values", {}).get("layout", "auto")
+            layout = resolve_layout(selection, EvaluationWorkspace(self.evaluation).read_labels(), choice)
+            variant = replace(variant, program="annotate-grouped" if layout == "grouped" else "annotate-checks")
+        return [build_command(self.repository, self.current_step, variant,
+                              {**values, "target": target}, self._evaluation_arg()) for target in targets]
+
     def _make_command(self) -> list[str]:
         if not self.current_step:
             return []
+        if self.current_step.section == REFAIRE_SECTION:
+            return self._refaire_commands()[0]
         return build_command(
             self.repository,
             self.current_step,
@@ -731,11 +849,15 @@ class CopienatorApp(tk.Tk):
         if self._rendering or not self.current_step:
             return
         if self.current_step.is_manual:
-            self.command_var.set("Étape manuelle — aucune commande ne sera exécutée.")
+            self.command_var.set("La sélection sera utilisée pour toutes les étapes de ce parcours." if self.current_step.id == "refaire_selection" else "Étape manuelle — aucune commande ne sera exécutée.")
             return
         try:
-            self.command_var.set(command_display(self._make_command()))
-        except ValueError as exc:
+            commands = self._refaire_commands() if self.current_step.section == REFAIRE_SECTION else [self._make_command()]
+            preview = "\n".join(command_display(command) for command in commands[:2])
+            if len(commands) > 2:
+                preview += f"\nPuis {len(commands) - 2} autres copies, successivement."
+            self.command_var.set(preview)
+        except (OSError, ValueError, TypeError) as exc:
             self.command_var.set(f"Arguments invalides : {exc}")
 
     def _browse_target_file(self, variable: tk.Variable) -> None:
@@ -764,7 +886,7 @@ class CopienatorApp(tk.Tk):
                     return False
         try:
             self._make_command()
-        except ValueError as exc:
+        except (OSError, ValueError, TypeError) as exc:
             messagebox.showerror("Arguments invalides", str(exc))
             return False
         return True
@@ -775,11 +897,22 @@ class CopienatorApp(tk.Tk):
         if not step or not evaluation or not self.state_store.evaluation:
             messagebox.showerror("Évaluation absente", "Chargez d’abord un dossier d’évaluation.")
             return
-        if self.runner.running:
+        if self.active_step_id or self.runner.running:
             messagebox.showwarning("Traitement en cours", "Interrompez le traitement actuel avant d’en lancer un autre.")
             return
+        if step.id == "refaire_selection":
+            self._save_refaire_selection()
+            return
+        if step.section == REFAIRE_SECTION:
+            try:
+                self._refaire_selection()
+            except (OSError, ValueError, TypeError) as exc:
+                messagebox.showerror("Sélection à vérifier", str(exc))
+                return
         if step.is_manual:
             self._mark_step("success")
+            if step.section == REFAIRE_SECTION:
+                self._move_selection_from(step.id, 1)
             return
         if os.name == "nt" and step.id != "statement":
             labels_path = evaluation / "labels"
@@ -816,7 +949,7 @@ class CopienatorApp(tk.Tk):
 
         self._save_current_form()
         run_values = self._values()
-        ordered_ids = [item.id for item in self.steps]
+        ordered_ids = self._progression_ids(step.id)
         self.state_store.invalidate_after(ordered_ids, step.id)
         self.state_store.update_step(
             step.id,
@@ -837,6 +970,8 @@ class CopienatorApp(tk.Tk):
             self.use_proxy_var.get(),
         )
 
+        self.pending_refaire_commands = self._refaire_commands()[1:] if step.section == REFAIRE_SECTION else []
+        self.refaire_command_index = 1
         self._append_console(f"\n$ {command_display(command)}\n")
         try:
             self.runner.start(command, self.repository, environment, log_path)
@@ -846,6 +981,7 @@ class CopienatorApp(tk.Tk):
                 {"step": step.id, "command": command_display(command), "status": "failed", "error": str(exc)}
             )
             self.active_step_id = None
+            self.pending_refaire_commands = []
             self._append_console(f"Impossible de lancer la commande : {exc}\n")
             messagebox.showerror("Échec du lancement", str(exc))
         self._populate_tree()
@@ -854,10 +990,10 @@ class CopienatorApp(tk.Tk):
     def _mark_step(
         self, status: str, *, automatic: bool = False, reason: str | None = None
     ) -> None:
-        if not self.current_step or not self.state_store.evaluation:
+        if not self.current_step or not self.state_store.evaluation or self.active_step_id:
             return
         self._save_current_form()
-        self.state_store.invalidate_after([item.id for item in self.steps], self.current_step.id)
+        self.state_store.invalidate_after(self._progression_ids(self.current_step.id), self.current_step.id)
         self.state_store.update_step(self.current_step.id, status=status)
         history: dict[str, object] = {
             "step": self.current_step.id,
@@ -875,7 +1011,10 @@ class CopienatorApp(tk.Tk):
 
     def _skip_step(self) -> None:
         if self.current_step and self.current_step.optional:
+            step_id = self.current_step.id
             self._mark_step("skipped")
+            if step_id.startswith("refaire_"):
+                self._move_selection_from(step_id, 1)
 
     def _poll_runner(self) -> None:
         while True:
@@ -899,6 +1038,26 @@ class CopienatorApp(tk.Tk):
         if not step_id:
             return
         status = process_status(return_code, interrupted)
+        if status == "success" and self.pending_refaire_commands:
+            command = self.pending_refaire_commands.pop(0)
+            self.refaire_command_index += 1
+            self._append_console(f"\n$ {command_display(command)}\n")
+            self.state_store.update_step(step_id, command=command_display(command))
+            try:
+                self.runner.start(command, self.repository,
+                    build_runner_environment(os.environ, self.api_key_var.get(), self.proxy_var.get(), self.use_proxy_var.get()),
+                    self.state_store.workspace.log_path(f"{step_id}_{self.refaire_command_index}"))
+                self._update_controls()
+                return
+            except (OSError, RuntimeError) as exc:
+                self._append_console(f"Impossible de lancer la copie suivante : {exc}\n")
+                status, return_code = "failed", 1
+        self.pending_refaire_commands = []
+        if step_id == "refaire_merge" and status == "success":
+            for downstream in ("giving_names", "update_ods", "final_score", "personal_deploy", "personal_sent"):
+                entry = self.state_store.step(downstream)
+                if entry.get("status") in {"success", "detected", "skipped"}:
+                    self.state_store.update_step(downstream, status="stale")
         if step_id == "clean" and status == "success":
             self._append_console(
                 f"\n[Terminé — code {return_code} — {STATUS_LABELS[status]}]\n"
@@ -977,8 +1136,9 @@ class CopienatorApp(tk.Tk):
         self.console.configure(state="disabled")
 
     def _update_controls(self) -> None:
-        running = self.runner.running
+        running = bool(self.active_step_id) or self.runner.running
         self.run_button.configure(state="disabled" if running or not self.current_step else "normal")
+        self.skip_button.configure(state="normal" if not running and self.current_step and self.current_step.optional else "disabled")
         self.interrupt_button.configure(state="normal" if running else "disabled")
         self.force_button.configure(state="normal" if running else "disabled")
         self.send_button.configure(state="normal" if running else "disabled")
@@ -990,7 +1150,7 @@ class CopienatorApp(tk.Tk):
         self._move_selection_from(self.current_step.id, delta)
 
     def _move_selection_from(self, step_id: str, delta: int) -> None:
-        ids = [step.id for step in self.steps]
+        ids = self._progression_ids(step_id)
         try:
             index = ids.index(step_id)
         except ValueError:
diff --git a/copienator_gui/refaire.py b/copienator_gui/refaire.py
new file mode 100644
index 0000000..397b0ba
--- /dev/null
+++ b/copienator_gui/refaire.py
@@ -0,0 +1,244 @@
+"""Selection and command planning for the optional redo workflow."""
+
+from __future__ import annotations
+
+import re
+import tkinter as tk
+from pathlib import Path
+from tkinter import ttk
+
+from copienator import EvaluationWorkspace, read_json
+from copienator.utils import natural_key
+
+SECTION = "Refaire des copies (facultatif)"
+ALL_LABELS = "Toute la copie"
+ALL_COPIES = "Toutes les copies"
+LAYOUTS = {
+    "Automatique": "auto",
+    "Par question (groupé)": "grouped",
+    "Par copie": "copies",
+}
+
+
+def resolve_layout(
+    selection: list[list], labels: list[str], choice: str = "auto"
+) -> str:
+    if choice in {"grouped", "copies"}:
+        return choice
+    seen = set()
+    for _name, selected in selection:
+        current = set(selected or labels)
+        if seen & current:
+            return "grouped"
+        seen.update(current)
+    return "copies"
+
+
+def copies_with_answer(copies: dict[str, Path], label: str) -> list[str]:
+    return [
+        name
+        for name, path in copies.items()
+        if any(
+            (path.with_suffix("") / f"{label}{suffix}.pdf").is_file()
+            for suffix in ("", "_new")
+        )
+    ]
+
+
+def available_copies(evaluation: Path) -> dict[str, Path]:
+    return {
+        path.stem: path
+        for path in sorted((evaluation / "Copies").glob("Copie*.pdf"), key=natural_key)
+        if re.fullmatch(r"Copie\d+", path.stem)
+    }
+
+
+def validate_selection(
+    entries: object, copies: dict[str, Path], labels: list[str]
+) -> list[list]:
+    if not isinstance(entries, list) or not entries:
+        raise ValueError("Ajoutez au moins une copie à refaire.")
+    result = {}
+    for entry in entries:
+        if not isinstance(entry, list) or len(entry) != 2:
+            raise ValueError("Sélection de copies invalide.")
+        name, selected = entry
+        if not isinstance(name, str) or name not in copies:
+            raise ValueError(f"Copie introuvable : {name}")
+        if not isinstance(selected, list) or any(
+            not isinstance(label, str) or label not in labels for label in selected
+        ):
+            raise ValueError(f"Question inconnue pour {name}. Reprenez la sélection.")
+        if name in result:
+            raise ValueError(f"Copie sélectionnée plusieurs fois : {name}")
+        result[name] = sorted(set(selected), key=natural_key)
+    return [[name, result[name]] for name in sorted(result, key=natural_key)]
+
+
+def load_selection(evaluation: Path) -> list[list]:
+    return validate_selection(
+        read_json(evaluation / "refaire.json"),
+        available_copies(evaluation),
+        EvaluationWorkspace(evaluation).read_labels(),
+    )
+
+
+class RefaireSelection(ttk.Frame):
+    def __init__(
+        self,
+        parent,
+        evaluation: Path,
+        draft: dict,
+        directories: tuple[str, ...],
+        preferred: str,
+    ):
+        super().__init__(parent)
+        self.columnconfigure(1, weight=1)
+        self.copies = available_copies(evaluation)
+        self.labels = (
+            EvaluationWorkspace(evaluation).read_labels()
+            if (evaluation / "labels").is_file()
+            else []
+        )
+        self.entries = {}
+        self.error = ""
+        try:
+            entries = draft.get("selection")
+            if entries is None:
+                entries = read_json(evaluation / "refaire.json", default=[])
+            if entries:
+                self.entries = dict(
+                    validate_selection(entries, self.copies, self.labels)
+                )
+        except (OSError, ValueError, TypeError) as exc:
+            self.error = str(exc)
+        self.copy_var = tk.StringVar(value=next(iter(self.copies), ""))
+        self.label_var = tk.StringVar(value=ALL_LABELS)
+        source = draft.get("annotation_dir", preferred)
+        self.source_var = tk.StringVar(
+            value=source if source in directories else preferred
+        )
+        ttk.Label(self, text="Copie").grid(row=0, column=0, sticky="w", padx=(0, 8))
+        ttk.Combobox(
+            self,
+            textvariable=self.copy_var,
+            values=(ALL_COPIES, *self.copies),
+            state="readonly",
+            width=12,
+        ).grid(row=0, column=1, sticky="ew")
+        ttk.Label(self, text="Question").grid(row=1, column=0, sticky="w", pady=5)
+        ttk.Combobox(
+            self,
+            textvariable=self.label_var,
+            values=(ALL_LABELS, *self.labels),
+            state="readonly",
+            width=12,
+        ).grid(row=1, column=1, sticky="ew", pady=5)
+        ttk.Button(self, text="+ Ajouter", command=self.add).grid(
+            row=1, column=2, padx=(8, 0)
+        )
+        self.table = ttk.Treeview(
+            self, columns=("labels",), height=4, selectmode="browse"
+        )
+        self.table.heading("#0", text="Copie")
+        self.table.heading("labels", text="Questions à refaire")
+        self.table.column("#0", width=100, stretch=False)
+        self.table.column("labels", width=330)
+        self.table.grid(row=4, column=0, columnspan=3, sticky="nsew")
+        scrollbar = ttk.Scrollbar(self, orient="vertical", command=self.table.yview)
+        scrollbar.grid(row=4, column=3, sticky="ns")
+        self.table.configure(yscrollcommand=scrollbar.set)
+        ttk.Button(
+            self, text="Retirer la copie sélectionnée", command=self.remove
+        ).grid(row=5, column=0, columnspan=3, sticky="w", pady=5)
+        ttk.Label(self, text="Passage principal").grid(
+            row=3, column=0, sticky="w", padx=(0, 8)
+        )
+        ttk.Combobox(
+            self,
+            textvariable=self.source_var,
+            values=directories,
+            state="readonly",
+            width=12,
+        ).grid(row=3, column=1, sticky="ew")
+        layout = draft.get("layout", "auto")
+        self.layout_var = tk.StringVar(
+            value=next(
+                (name for name, code in LAYOUTS.items() if code == layout),
+                "Automatique",
+            )
+        )
+        ttk.Label(self, text="PDF à vérifier").grid(row=2, column=0, sticky="w")
+        ttk.Combobox(
+            self,
+            textvariable=self.layout_var,
+            values=tuple(LAYOUTS),
+            state="readonly",
+            width=12,
+        ).grid(row=2, column=1, sticky="ew")
+        self.message_var = tk.StringVar(
+            value=self.error
+            or "Choisissez « Toutes les copies » pour refaire une question dans toute la classe."
+        )
+        help_label = ttk.Label(
+            self,
+            textvariable=self.message_var,
+            wraplength=500,
+        )
+        help_label.grid(row=6, column=0, columnspan=3, sticky="w", pady=5)
+        self.bind(
+            "<Configure>",
+            lambda event: help_label.configure(wraplength=max(200, event.width - 10)),
+        )
+        self.refresh()
+
+    def refresh(self):
+        self.table.delete(*self.table.get_children())
+        for name in sorted(self.entries, key=natural_key):
+            self.table.insert(
+                "",
+                "end",
+                iid=name,
+                text=name,
+                values=(", ".join(self.entries[name]) or ALL_LABELS,),
+            )
+
+    def add(self):
+        name, label = self.copy_var.get(), self.label_var.get()
+        if name not in (ALL_COPIES, *self.copies) or label not in (
+            ALL_LABELS,
+            *self.labels,
+        ):
+            return
+        names = (
+            [name]
+            if name != ALL_COPIES
+            else list(self.copies)
+            if label == ALL_LABELS
+            else copies_with_answer(self.copies, label)
+        )
+        for copy_name in names:
+            # Adding a question must not narrow a copy already selected in full.
+            if label == ALL_LABELS:
+                self.entries[copy_name] = []
+            elif copy_name not in self.entries or self.entries[copy_name]:
+                self.entries[copy_name] = sorted(
+                    set(self.entries.get(copy_name, [])) | {label}, key=natural_key
+                )
+        message = f"{len(names)} copie(s) ajoutée(s)."
+        if name == ALL_COPIES and len(names) < len(self.copies):
+            message += f" {len(self.copies) - len(names)} sans réponse découpée pour cette question."
+        self.message_var.set(message)
+        self.refresh()
+
+    def remove(self):
+        for name in self.table.selection():
+            self.entries.pop(name, None)
+        self.refresh()
+
+    def values(self):
+        return {
+            "selection": [[name, labels] for name, labels in self.entries.items()],
+            "annotation_dir": self.source_var.get(),
+            "layout": LAYOUTS[self.layout_var.get()],
+        }
diff --git a/copienator_gui/workflow.py b/copienator_gui/workflow.py
index 90b51af..2271fc6 100644
--- a/copienator_gui/workflow.py
+++ b/copienator_gui/workflow.py
@@ -505,9 +505,46 @@ def build_workflow(show_personal_steps: bool) -> list[StepDefinition]:
             requires=("Copies", "correction.json", "A Rendre"),
         ),
     ]
+    steps[-1:-1] = build_refaire_workflow()
     return [step for step in steps if show_personal_steps or not step.personal]
 
 
+def build_refaire_workflow() -> list[StepDefinition]:
+    from .refaire import SECTION
+
+    selection = StepDefinition(
+        "refaire_selection", SECTION, "Choisir les copies et les questions",
+        "Sélectionnez les copies et les questions à refaire, puis enregistrez la sélection. "
+        "Le passage principal doit être terminé ; conservez ses annotations.",
+        (CommandVariant("default", "Sélection", None, "manual"),),
+        requires=("Copies", "labels", "correction.json"),
+    )
+    definitions = [
+        ("review", "Reprendre le découpage", "Vérifiez et ajustez les labels des copies sélectionnées. Chaque copie s’ouvre à son tour. Fermez la fenêtre pour passer à la suivante.", "review-labels", (), True),
+        ("split", "Redécouper les réponses", "À exécuter après une modification du découpage. Traite toutes les copies sélectionnées ; vérifiez les fichiers _new et _old en cas de résolution manuelle.", "split-answers", (), True),
+        ("correct", "Refaire la correction", "Relance la correction des seules questions sélectionnées. Peut être ignorée pour corriger manuellement les résultats.", "correct", ("--refaire",), True),
+        ("annotate", "Préparer les copies à vérifier", "Génère les questions sélectionnées avec des cases dans BRnot, par question ou par copie selon la sélection. Remplace le précédent passage dans BRnot.", "annotate-checks", ("--refaire", "--overwrite"), False),
+        ("export", "Exporter vers la tablette", "Exporte BRnot vers EXPORT_DIR. Retirez les anciens fichiers d’export avant le transfert.", "export", ("--refaire",), True),
+        ("tablet", "Vérifier sur la tablette", "Annotez les PDF exportés, puis placez les retours dans IMPORT_DIR sans changer leur nom (nom de groupe ou Copie01.pdf…). Retournez aussi les PDF sans modification. Retirez les anciens fichiers d’import.", None, (), False),
+        ("import", "Importer les copies vérifiées", "Importe les PDF retournés dans BRnot. Vous pouvez ignorer cette étape si les fichiers Concat_annotated.pdf y sont déjà en place.", "import", ("--refaire",), True),
+        ("merge", "Mettre à jour les copies finales", "Fusionne les questions refaites avec le reste de chaque copie dans le dossier du passage principal. Relancez ensuite la préparation de A Rendre, le calcul des notes et la diffusion.", "read-grouped", ("--refaire",), False),
+    ]
+    steps = [selection]
+    for suffix, title, description, program, flags, optional in definitions:
+        arguments = (arg_target(),) if program else ()
+        if suffix == "merge":
+            arguments += (ArgumentSpec("annotation_dir", "Passage principal", "choice", "--annotation-dir", default="BGnot", choices=("BGnot", "Bnot", "Anot")),)
+        requirements = ("refaire.json", "Copies", "labels", "correction.json")
+        if suffix in {"export", "tablet", "import", "merge"}:
+            requirements += ("BRnot",)
+        steps.append(StepDefinition(
+            f"refaire_{suffix}", SECTION, title, description,
+            (CommandVariant("default", title, program, "python" if program else "manual", flags),),
+            arguments=arguments, optional=optional, requires=requirements,
+        ))
+    return steps
+
+
 def value_for_default(value: object, evaluation_arg: str) -> object:
     return evaluation_arg if value == EVALUATION else value
 
diff --git a/tests/test_grouped_refaire.py b/tests/test_grouped_refaire.py
new file mode 100644
index 0000000..84d5a2b
--- /dev/null
+++ b/tests/test_grouped_refaire.py
@@ -0,0 +1,206 @@
+from __future__ import annotations
+
+import shutil
+import tempfile
+import unittest
+from pathlib import Path
+from unittest.mock import patch
+
+from PIL import Image, ImageDraw
+
+from copienator import EvaluationWorkspace, ExitCode, atomic_write_json, read_json
+from copienator.annotation_data import AnnotationLoadResult
+from copienator.commands import annotating_by_label as grouped
+from copienator.commands import annotating_with_checks as checks
+from copienator.commands import export, import_annotations
+from copienator.commands import reading_grouped_annotations as reader
+
+
+class GroupedRedoTests(unittest.TestCase):
+    def setUp(self):
+        self.temp = tempfile.TemporaryDirectory()
+        self.root = Path(self.temp.name) / "Exam"
+        for directory in ("Copies", "Par label", "BGnot", "BRnot"):
+            (self.root / directory).mkdir(parents=True)
+        (self.root / "labels").write_text("Ex 1\nEx 2\n")
+        atomic_write_json(self.root / "correction.json", {})
+        atomic_write_json(
+            self.root / "refaire.json", [["Copie01", ["Ex 1"]], ["Copie02", ["Ex 1"]]]
+        )
+        (self.root / "BRnot/previous.txt").write_text("previous redo")
+        (self.root / "BGnot/main.txt").write_text("main run")
+        self.workspace = EvaluationWorkspace(self.root)
+        self.data = {"01": {"Ex 1": {}}, "02": {"Ex 1": {}}}
+
+    def tearDown(self):
+        self.temp.cleanup()
+
+    @staticmethod
+    def render(item):
+        student_id, label, _content = item
+        image = Image.new("RGB", (100, 100), "white")
+        ImageDraw.Draw(image).rectangle((10, 10, 50, 50), outline="black", width=2)
+        return (
+            student_id,
+            label,
+            image,
+            0,
+            [
+                {
+                    "type": "score",
+                    "label": label,
+                    "value": 3,
+                    "final_box": [10, 10, 50, 50],
+                }
+            ],
+        )
+
+    def generate(self):
+        with (
+            patch.object(
+                grouped,
+                "load_annotation_data",
+                return_value=AnnotationLoadResult(self.data, []),
+            ) as load,
+            patch.object(grouped, "render_item", side_effect=self.render),
+            patch.object(grouped, "_load_label_groups") as label_groups,
+        ):
+            self.assertEqual(
+                grouped.run(self.workspace, refaire=True, overwrite=True),
+                ExitCode.SUCCESS,
+            )
+            self.assertEqual(
+                load.call_args.kwargs["refaire_list"],
+                read_json(self.root / "refaire.json"),
+            )
+            label_groups.assert_not_called()
+        directories = list((self.root / "BRnot").iterdir())
+        self.assertEqual(len(directories), 1)
+        self.assertTrue(directories[0].is_dir())
+        self.assertEqual((self.root / "BGnot/main.txt").read_text(), "main run")
+        return directories[0]
+
+    def test_grouped_redo_export_import_and_actual_annotation_detection(self):
+        directory = self.generate()
+        metadata = read_json(directory / "bnote.json")["images"]
+        self.assertEqual(
+            [(item["id"], item["label"]) for item in metadata],
+            [("01", "Ex 1"), ("02", "Ex 1")],
+        )
+        export_root = Path(self.temp.name) / "Export"
+        with patch.object(export, "EXPORT_DIR", export_root):
+            self.assertEqual(export.run(self.workspace, refaire=True), ExitCode.SUCCESS)
+        self.assertEqual(len(list((export_root / "Exam").glob("*.pdf"))), 1)
+        imported_root = Path(self.temp.name) / "Import"
+        imported_root.mkdir()
+        with Image.open(directory / "Reference.jpg") as reference:
+            annotated = reference.convert("RGB")
+        draw = ImageDraw.Draw(annotated)
+        draw.rectangle((17, 17, 43, 43), fill="black")
+        draw.rectangle((70, 170, 90, 190), fill="black")
+        annotated.save(imported_root / f"{directory.name}.pdf", "PDF", resolution=72)
+        with patch.object(import_annotations, "IMPORT_DIR", imported_root):
+            self.assertEqual(
+                import_annotations.run(self.workspace, refaire=True), ExitCode.SUCCESS
+            )
+        actions, notes, incomplete = reader._scan_redo_annotations(
+            self.root / "BRnot", {"01": {"Ex 1"}, "02": {"Ex 1"}}
+        )
+        self.assertFalse(incomplete)
+        self.assertEqual(actions["01"][0]["value"], 3)
+        self.assertFalse(actions.get("02"))
+        self.assertIn("Ex 1", notes["02"])
+        full_data = {student: {"Ex 1": {}, "Ex 2": {}} for student in ("01", "02")}
+        for mode in ("BGnot", "Bnot", "Anot"):
+            (self.root / mode).mkdir(exist_ok=True)
+            with (
+                self.subTest(mode=mode),
+                patch.object(
+                    reader,
+                    "load_annotation_data",
+                    return_value=AnnotationLoadResult(full_data, []),
+                ),
+                patch.object(
+                    reader,
+                    "apply_actions_and_regenerate_grouped",
+                    return_value=(ExitCode.SUCCESS, ""),
+                ) as regenerate,
+            ):
+                self.assertEqual(
+                    reader.run(self.workspace, refaire=True, annotation_dir=mode),
+                    ExitCode.SUCCESS,
+                )
+                calls = {call.args[2]: call for call in regenerate.call_args_list}
+                self.assertEqual(set(calls), {"01", "02"})
+                self.assertEqual(set(calls["01"].args[1]["01"]), {"Ex 1", "Ex 2"})
+                self.assertEqual(calls["01"].args[3][0]["value"], 3)
+                self.assertIn("Ex 1", calls["02"].args[4])
+
+    def test_missing_group_leaves_affected_copy_incomplete(self):
+        directory = self.generate()
+        shutil.copy2(directory / "Concat.pdf", directory / "Concat_annotated.pdf")
+        extra = self.root / "BRnot/Ex 2 G1"
+        extra.mkdir()
+        atomic_write_json(
+            extra / "bnote.json", {"images": [{"id": "01", "label": "Ex 2"}]}
+        )
+        _actions, _notes, incomplete = reader._scan_redo_annotations(
+            self.root / "BRnot", {"01": {"Ex 1", "Ex 2"}, "02": {"Ex 1"}}
+        )
+        self.assertEqual(incomplete, {"01"})
+
+    def test_failed_generation_preserves_previous_redo_for_both_layouts(self):
+        for module, worker in ((grouped, "render_item"), (checks, "_render_student")):
+            with (
+                self.subTest(module=module),
+                patch.object(
+                    module,
+                    "load_annotation_data",
+                    return_value=AnnotationLoadResult(self.data, []),
+                ),
+                patch.object(
+                    module,
+                    worker,
+                    return_value=None if module is grouped else "partial",
+                ),
+            ):
+                if module is grouped:
+                    status = module.run(self.workspace, refaire=True, overwrite=True)
+                else:
+                    status = module.run(
+                        self.workspace, self.root, refaire=True, overwrite=True
+                    )
+                self.assertEqual(status, ExitCode.PARTIAL)
+                self.assertEqual(
+                    (self.root / "BRnot/previous.txt").read_text(), "previous redo"
+                )
+
+    def test_switching_to_per_copy_removes_previous_group_layout(self):
+        self.generate()
+
+        def render(_workspace, student_id, _labels, **kwargs):
+            output = kwargs["output_root"] / f"Copie{student_id}"
+            output.mkdir()
+            (output / "Concat.pdf").touch()
+            return "success"
+
+        with (
+            patch.object(
+                checks,
+                "load_annotation_data",
+                return_value=AnnotationLoadResult(self.data, []),
+            ),
+            patch.object(checks, "_render_student", side_effect=render),
+        ):
+            self.assertEqual(
+                checks.run(self.workspace, self.root, refaire=True, overwrite=True),
+                ExitCode.SUCCESS,
+            )
+        self.assertEqual(
+            {path.name for path in (self.root / "BRnot").iterdir()},
+            {"Copie01", "Copie02"},
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/tests/test_gui_refaire.py b/tests/test_gui_refaire.py
new file mode 100644
index 0000000..6a2b59c
--- /dev/null
+++ b/tests/test_gui_refaire.py
@@ -0,0 +1,265 @@
+from __future__ import annotations
+
+import os
+import tempfile
+import unittest
+from pathlib import Path
+from unittest.mock import patch
+
+from copienator import atomic_write_json, read_json
+from copienator_gui.app import CopienatorApp
+from copienator_gui.refaire import (
+    ALL_COPIES,
+    SECTION,
+    available_copies,
+    resolve_layout,
+    validate_selection,
+)
+from copienator_gui.workflow import build_command, build_workflow
+
+
+class SelectionTests(unittest.TestCase):
+    def test_selection_validates_and_deduplicates_labels(self):
+        copies = {"Copie01": Path("/tmp/Copie01.pdf")}
+        self.assertEqual(
+            validate_selection(
+                [["Copie01", ["Ex 2", "Ex 1", "Ex 2"]]], copies, ["Ex 1", "Ex 2"]
+            ),
+            [["Copie01", ["Ex 1", "Ex 2"]]],
+        )
+        for invalid in (
+            [],
+            [["missing", []]],
+            [["Copie01", ["unknown"]]],
+            [["../Copie01", []]],
+        ):
+            with self.subTest(invalid=invalid), self.assertRaises(ValueError):
+                validate_selection(invalid, copies, ["Ex 1"])
+
+    def test_automatic_layout_groups_shared_labels_and_honors_explicit_choice(self):
+        selection = [["Copie01", ["Ex 1"]], ["Copie02", ["Ex 1"]]]
+        self.assertEqual(resolve_layout(selection, ["Ex 1", "Ex 2"]), "grouped")
+        self.assertEqual(resolve_layout(selection, ["Ex 1"], "copies"), "copies")
+        self.assertEqual(resolve_layout([["Copie01", ["Ex 1"]]], ["Ex 1"]), "copies")
+        self.assertEqual(
+            resolve_layout([["Copie01", ["Ex 1"]], ["Copie02", []]], ["Ex 1"]),
+            "grouped",
+        )
+
+    def test_redo_steps_are_in_both_profiles_and_never_autostart(self):
+        for personal in (False, True):
+            steps = [
+                step for step in build_workflow(personal) if step.section == SECTION
+            ]
+            self.assertEqual(len(steps), 9)
+            self.assertEqual(steps[0].id, "refaire_selection")
+            self.assertTrue(all(not step.auto_start_first_visit for step in steps))
+            merge = steps[-1]
+            for mode in ("BGnot", "Bnot", "Anot"):
+                command = build_command(
+                    Path.cwd(),
+                    merge,
+                    merge.variants[0],
+                    {"target": "/tmp/Exam", "annotation_dir": mode},
+                    "/tmp/Exam",
+                )
+                self.assertEqual(
+                    command[4:],
+                    [
+                        "read-grouped",
+                        "/tmp/Exam",
+                        "--refaire",
+                        "--annotation-dir",
+                        mode,
+                    ],
+                )
+
+
+@unittest.skipUnless(
+    os.environ.get("DISPLAY"), "Tk tests require a display (use xvfb-run)"
+)
+class RefaireGuiTests(unittest.TestCase):
+    def setUp(self):
+        self.temp = tempfile.TemporaryDirectory()
+        self.root = Path(self.temp.name)
+        (self.root / "Copies").mkdir()
+        (self.root / "Anot").mkdir()
+        (self.root / "Par label").mkdir()
+        (self.root / "BRnot").mkdir()
+        for name in ("Copie01", "Copie02"):
+            (self.root / "Copies" / f"{name}.pdf").touch()
+        (self.root / "labels").write_text("Ex 1\nEx 2\n", encoding="utf-8")
+        atomic_write_json(self.root / "correction.json", {})
+        self.app = CopienatorApp(Path.cwd(), False, self.root)
+        self.app.update()
+
+    def tearDown(self):
+        for callback in self.app.tk.splitlist(self.app.tk.call("after", "info")):
+            self.app.after_cancel(callback)
+        self.app.destroy()
+        self.temp.cleanup()
+
+    def select(self, ident):
+        self.app.tree.selection_set(ident)
+        self.app.tree.see(ident)
+        self.app.update()
+
+    def save_selection(self):
+        self.select("refaire_selection")
+        panel = self.app.refaire_panel
+        panel.label_var.set("Ex 1")
+        panel.add()
+        panel.label_var.set("Ex 2")
+        panel.add()
+        panel.copy_var.set("Copie02")
+        panel.label_var.set("Toute la copie")
+        panel.add()
+        self.app._run_current_step()
+        self.app.update()
+
+    def test_collapsed_branch_is_separate_and_stays_open_when_refreshed(self):
+        section = self.app.tree.parent("refaire_selection")
+        self.assertFalse(self.app.tree.item(section, "open"))
+        self.assertNotIn("refaire_selection", self.app._progression_ids("giving_names"))
+        self.assertNotIn("clean", self.app._progression_ids("refaire_merge"))
+        self.select("refaire_selection")
+        self.app._populate_tree()
+        self.assertTrue(self.app.tree.item(section, "open"))
+
+    def test_dropdown_selection_saves_json_and_drives_all_commands(self):
+        self.save_selection()
+        self.assertEqual(
+            read_json(self.root / "refaire.json"),
+            [["Copie01", ["Ex 1", "Ex 2"]], ["Copie02", []]],
+        )
+        self.assertEqual(self.app.current_step.id, "refaire_review")
+        commands = self.app._refaire_commands()
+        self.assertEqual(
+            [command[5] for command in commands],
+            [str(path) for path in available_copies(self.root).values()],
+        )
+        self.select("refaire_annotate")
+        self.assertEqual(
+            self.app._make_command()[4:],
+            ["annotate-grouped", str(self.root), "--refaire", "--overwrite"],
+        )
+        self.select("refaire_merge")
+        self.assertEqual(
+            self.app._make_command()[4:],
+            ["read-grouped", str(self.root), "--refaire", "--annotation-dir", "Anot"],
+        )
+        self.assertEqual(self.app.state_store.step("annotation").get("status"), None)
+
+    def test_one_label_for_all_copies_and_layout_override(self):
+        for name in ("Copie01", "Copie02"):
+            directory = self.root / "Copies" / name
+            directory.mkdir()
+            (directory / "Ex 1.pdf").touch()
+        self.select("refaire_selection")
+        panel = self.app.refaire_panel
+        panel.copy_var.set(ALL_COPIES)
+        panel.label_var.set("Ex 1")
+        panel.add()
+        self.assertEqual(panel.entries, {"Copie01": ["Ex 1"], "Copie02": ["Ex 1"]})
+        panel.layout_var.set("Par copie")
+        self.app._run_current_step()
+        self.app.update()
+        self.select("refaire_annotate")
+        self.assertEqual(self.app._make_command()[4], "annotate-checks")
+
+    def test_bulk_add_skips_absent_answers_and_preserves_whole_copy_selection(self):
+        directory = self.root / "Copies/Copie01"
+        directory.mkdir()
+        (directory / "Ex 1_new.pdf").touch()
+        self.select("refaire_selection")
+        panel = self.app.refaire_panel
+        panel.copy_var.set("Copie01")
+        panel.add()
+        panel.copy_var.set(ALL_COPIES)
+        panel.label_var.set("Ex 1")
+        panel.add()
+        self.assertEqual(panel.entries, {"Copie01": []})
+        self.assertIn("1 sans réponse", panel.message_var.get())
+
+    def test_correction_folder_buttons_open_expected_folders(self):
+        for name in ("Sol", "Persp"):
+            (self.root / name).mkdir()
+        self.select("refaire_selection")
+        buttons = self.app.form.winfo_children()[0].winfo_children()
+        with patch("copienator_gui.app.open_path") as opened:
+            for button in buttons:
+                button.invoke()
+        self.assertEqual(
+            [call.args[0] for call in opened.call_args_list],
+            [self.root / "Sol", self.root / "Persp"],
+        )
+
+    def test_small_window_keeps_selection_accessible_by_scrolling(self):
+        self.select("refaire_selection")
+        self.app.geometry("900x640")
+        self.app.update()
+        self.app.form_canvas.yview_moveto(1)
+        self.app.update()
+        self.assertAlmostEqual(self.app.form_canvas.yview()[1], 1.0)
+        self.assertLess(
+            self.app.run_button.winfo_rooty() + self.app.run_button.winfo_height(),
+            self.app.winfo_rooty() + self.app.winfo_height(),
+        )
+
+    def test_queue_runs_copies_in_order_and_stops_on_failure(self):
+        self.save_selection()
+        self.select("refaire_split")
+        with patch.object(self.app.runner, "start") as start:
+            self.app._run_current_step()
+            self.assertEqual(start.call_count, 1)
+            self.assertEqual(len(self.app.pending_refaire_commands), 1)
+            self.app._finish_process(0, False)
+            self.assertEqual(start.call_count, 2)
+            self.assertEqual(self.app.active_step_id, "refaire_split")
+            self.app._finish_process(1, False)
+            self.assertEqual(
+                self.app.state_store.step("refaire_split")["status"], "failed"
+            )
+            self.assertIsNone(self.app.active_step_id)
+            self.assertFalse(self.app.pending_refaire_commands)
+
+    def test_interruption_does_not_launch_next_copy(self):
+        self.save_selection()
+        self.select("refaire_split")
+        with patch.object(self.app.runner, "start") as start:
+            self.app._run_current_step()
+            self.app._finish_process(130, True)
+            self.assertEqual(start.call_count, 1)
+            self.assertFalse(self.app.pending_refaire_commands)
+            self.assertEqual(
+                self.app.state_store.step("refaire_split")["status"], "interrupted"
+            )
+
+    def test_unsaved_or_external_changes_block_commands(self):
+        self.save_selection()
+        atomic_write_json(self.root / "refaire.json", [["Copie02", []]])
+        with self.assertRaisesRegex(ValueError, "sélection a changé"):
+            self.app._refaire_commands()
+
+    def test_selection_reload_and_finalization_invalidation(self):
+        self.save_selection()
+        self.app.state_store.update_step("giving_names", status="success")
+        self.app.state_store.update_step(
+            "annotation", status="success", last_run_variant="simple"
+        )
+        self.select("refaire_merge")
+        with patch.object(self.app.runner, "start"):
+            self.app._run_current_step()
+            self.app._finish_process(0, False)
+        self.app.update()
+        self.assertEqual(self.app.state_store.step("giving_names")["status"], "stale")
+        self.assertEqual(self.app.state_store.step("annotation")["status"], "success")
+        self.assertEqual(self.app.current_step.id, "refaire_merge")
+        self.select("refaire_selection")
+        self.assertEqual(
+            self.app.refaire_panel.entries, {"Copie01": ["Ex 1", "Ex 2"], "Copie02": []}
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/tests/test_refaire.py b/tests/test_refaire.py
new file mode 100644
index 0000000..dc5548b
--- /dev/null
+++ b/tests/test_refaire.py
@@ -0,0 +1,280 @@
+from __future__ import annotations
+
+import tempfile
+import unittest
+from pathlib import Path
+from unittest.mock import patch
+
+from PIL import Image
+
+from copienator import EvaluationWorkspace, ExitCode, atomic_write_json, read_json
+from copienator.annotation_data import AnnotationLoadResult, _coordinate_index
+from copienator.commands import reading_grouped_annotations as reader
+
+
+class RefaireTests(unittest.TestCase):
+    def workspace(self, root, mode):
+        for name in ("Copies", "Par label", mode, "BRnot/Copie01"):
+            (root / name).mkdir(parents=True)
+        (root / "labels").write_text("Ex 1\nEx 2\n")
+        atomic_write_json(root / "correction.json", {})
+        atomic_write_json(root / "refaire.json", [["Copie01", ["Ex 2"]]])
+        for name in (
+            "bnote.json",
+            "checkboxes.json",
+            "Reference.jpg",
+            "Concat_annotated.pdf",
+        ):
+            (root / "BRnot/Copie01" / name).touch()
+        atomic_write_json(
+            root / "BRnot/Copie01/bnote.json", {"images": [{"label": "Ex 2"}]}
+        )
+        return EvaluationWorkspace(root)
+
+    def test_reader_merges_full_copy_for_every_original_mode(self):
+        for mode in ("BGnot", "Bnot", "Anot"):
+            with self.subTest(mode=mode), tempfile.TemporaryDirectory() as tmp:
+                workspace = self.workspace(Path(tmp), mode)
+                data = {"01": {"Ex 1": {}, "Ex 2": {}}, "02": {"Ex 1": {}}}
+
+                def load(_workspace, data=data, **kwargs):
+                    return AnnotationLoadResult(
+                        {"01": {"Ex 2": {}}} if kwargs else data, []
+                    )
+
+                with (
+                    patch.object(reader, "load_annotation_data", side_effect=load),
+                    patch.object(
+                        reader,
+                        "_scan_annotation_directory",
+                        return_value=(
+                            {"01": [{"label": "Ex 2", "type": "score", "value": 3}]},
+                            {},
+                        ),
+                    ),
+                    patch.object(
+                        reader,
+                        "apply_actions_and_regenerate_grouped",
+                        return_value=(ExitCode.SUCCESS, ""),
+                    ) as render,
+                ):
+                    self.assertEqual(
+                        reader.run(workspace, refaire=True, annotation_dir=mode),
+                        ExitCode.SUCCESS,
+                    )
+                render.assert_called_once()
+                self.assertEqual(set(render.call_args.args[1]["01"]), {"Ex 1", "Ex 2"})
+                self.assertEqual(render.call_args.args[2], "01")
+                self.assertEqual(render.call_args.kwargs["selected_labels"], {"Ex 2"})
+                self.assertEqual(render.call_args.kwargs["annotation_dir"], mode)
+
+    def test_whole_copy_selection_replaces_all_old_actions(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            workspace = self.workspace(root, "BGnot")
+            (root / "BGnot/Ex 1").mkdir()
+            atomic_write_json(root / "refaire.json", [["Copie01", []]])
+            atomic_write_json(
+                root / "BRnot/Copie01/bnote.json",
+                {"images": [{"label": label} for label in ("Ex 1", "Ex 2")]},
+            )
+            loaded = AnnotationLoadResult({"01": {"Ex 1": {}, "Ex 2": {}}}, [])
+
+            def scan(directory, *args, **kwargs):
+                return (
+                    ({"01": [{"label": "Ex 1", "type": "score", "value": 1}]}, {})
+                    if directory.parent.name == "BGnot"
+                    else ({"01": [{"label": "Ex 2", "type": "score", "value": 4}]}, {})
+                )
+
+            with (
+                patch.object(reader, "load_annotation_data", return_value=loaded),
+                patch.object(reader, "_scan_annotation_directory", side_effect=scan),
+                patch.object(
+                    reader,
+                    "apply_actions_and_regenerate_grouped",
+                    return_value=(ExitCode.SUCCESS, ""),
+                ) as render,
+            ):
+                self.assertEqual(reader.run(workspace, refaire=True), ExitCode.SUCCESS)
+            self.assertEqual(
+                render.call_args.kwargs["selected_labels"], {"Ex 1", "Ex 2"}
+            )
+            self.assertEqual(
+                render.call_args.args[3],
+                [{"label": "Ex 2", "type": "score", "value": 4}],
+            )
+
+    def test_stale_redo_selection_is_rejected(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            workspace = self.workspace(root, "Anot")
+            atomic_write_json(
+                root / "BRnot/Copie01/bnote.json", {"images": [{"label": "Ex 1"}]}
+            )
+            with (
+                patch.object(
+                    reader,
+                    "load_annotation_data",
+                    return_value=AnnotationLoadResult({"01": {"Ex 2": {}}}, []),
+                ),
+                patch.object(reader, "apply_actions_and_regenerate_grouped") as render,
+            ):
+                self.assertEqual(
+                    reader.run(workspace, refaire=True, annotation_dir="Anot"),
+                    ExitCode.PARTIAL,
+                )
+            render.assert_not_called()
+
+    def test_missing_redo_return_leaves_copy_untouched(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            workspace = self.workspace(root, "BGnot")
+            (root / "BRnot/Copie01/Concat_annotated.pdf").unlink()
+            with (
+                patch.object(
+                    reader,
+                    "load_annotation_data",
+                    return_value=AnnotationLoadResult({"01": {"Ex 2": {}}}, []),
+                ),
+                patch.object(reader, "apply_actions_and_regenerate_grouped") as render,
+            ):
+                self.assertEqual(reader.run(workspace, refaire=True), ExitCode.PARTIAL)
+            render.assert_not_called()
+
+    def test_regeneration_preserves_untouched_image_and_score_and_saves_redo(self):
+        for mode in ("BGnot", "Bnot", "Anot"):
+            with self.subTest(mode=mode), tempfile.TemporaryDirectory() as tmp:
+                root = Path(tmp)
+                workspace = self.workspace(root, mode)
+                output = root / mode / "Copie01"
+                output.mkdir()
+                Image.new("RGB", (40, 30), "red").save(output / "Ex 1.jpg")
+                before = (output / "Ex 1.jpg").read_bytes()
+                atomic_write_json(output / "score.json", {"Ex 1": "3.5", "Ex 2": "0"})
+                answer = root / "answer.pdf"
+                answer.touch()
+                data = {
+                    "01": {
+                        label: {
+                            "result": {"score": 2, "feedback": []},
+                            "pdf_path": answer,
+                            "coordinates": (0, 0),
+                        }
+                        for label in ("Ex 1", "Ex 2")
+                    }
+                }
+                with (
+                    patch.object(
+                        reader.annotating,
+                        "make_base_image",
+                        return_value=(Image.new("RGB", (40, 20)), 0, 0),
+                    ),
+                    patch.object(
+                        reader.annotating,
+                        "compose_label_image",
+                        return_value=(Image.new("RGB", (40, 20), "blue"), 0),
+                    ),
+                    patch.object(reader, "get_extra_pdfs_as_images", return_value=[]),
+                ):
+                    status, _ = reader.apply_actions_and_regenerate_grouped(
+                        workspace,
+                        data,
+                        "01",
+                        [],
+                        {},
+                        ["Ex 1", "Ex 2"],
+                        annotation_dir=mode,
+                        selected_labels={"Ex 2"},
+                    )
+                self.assertEqual(status, ExitCode.SUCCESS)
+                self.assertEqual(
+                    read_json(output / "score.json"), {"Ex 1": "3.5", "Ex 2": "2"}
+                )
+                self.assertEqual((output / "Ex 1.jpg").read_bytes(), before)
+                self.assertTrue((output / "Ex 2.jpg").is_file())
+                with Image.open(output / "Concat.jpg") as concat:
+                    self.assertEqual(concat.size, (40, 50))
+
+    def test_simple_import_survives_successive_redos(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            workspace = self.workspace(root, "Anot")
+            output = root / "Anot/Copie01"
+            output.mkdir()
+            for label in ("Ex 1", "Ex 2"):
+                Image.new("RGB", (40, 30), "white").save(output / f"{label}.jpg")
+            Image.new("RGB", (40, 60), "red").save(output / "Concat_annotated.jpg")
+            atomic_write_json(output / "score.json", {"Ex 1": "1", "Ex 2": "1"})
+            answer = root / "answer.pdf"
+            answer.touch()
+            data = {
+                "01": {
+                    label: {
+                        "result": {"score": 2, "feedback": []},
+                        "pdf_path": answer,
+                        "coordinates": (0, 0),
+                    }
+                    for label in ("Ex 1", "Ex 2")
+                }
+            }
+            with (
+                patch.object(
+                    reader.annotating,
+                    "make_base_image",
+                    return_value=(Image.new("RGB", (40, 20)), 0, 0),
+                ),
+                patch.object(
+                    reader.annotating,
+                    "compose_label_image",
+                    return_value=(Image.new("RGB", (40, 20), "blue"), 0),
+                ),
+            ):
+                for selected in ({"Ex 2"}, {"Ex 1"}):
+                    status, _ = reader.apply_actions_and_regenerate_grouped(
+                        workspace,
+                        data,
+                        "01",
+                        [],
+                        {},
+                        ["Ex 1", "Ex 2"],
+                        annotation_dir="Anot",
+                        selected_labels=selected,
+                    )
+                    self.assertEqual(status, ExitCode.SUCCESS)
+                    if selected == {"Ex 2"}:
+                        with Image.open(output / "Ex 1.jpg") as untouched:
+                            self.assertGreater(untouched.getpixel((10, 10))[0], 240)
+                with Image.open(output / "Concat.jpg") as concat:
+                    self.assertEqual(concat.size, (40, 40))
+                    self.assertGreater(concat.getpixel((10, 30))[2], 240)
+
+    def test_latest_group_coordinates_win_numerically(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            group = root / "Par label" / "Ex 1"
+            group.mkdir(parents=True)
+            for number, height in ((2, 100), (10, 40)):
+                atomic_write_json(
+                    group / f"Group_{number}.json", [["01", 0, height, "", "Ex 1"]]
+                )
+                Image.new("RGB", (20, height)).save(group / f"Group_{number}.jpg")
+            index, warnings = _coordinate_index(EvaluationWorkspace(root))
+            self.assertFalse(warnings)
+            self.assertEqual(index[("Ex 1", "01")].height, 40)
+
+    def test_unreadable_redo_is_rejected(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            root = Path(tmp)
+            atomic_write_json(root / "bnote.json", {"images": []})
+            with (
+                patch.object(
+                    reader, "detect_checks_and_notes", return_value=([], None)
+                ),
+                self.assertRaises(ValueError),
+            ):
+                reader._scan_annotation_directory(root, required=True)
+
+
+if __name__ == "__main__":
+    unittest.main()