diff --git a/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/QuestionExtension.kt b/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/QuestionExtension.kt
new file mode 100644
index 0000000..b42908e
--- /dev/null
+++ b/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/QuestionExtension.kt
@@ -0,0 +1,30 @@
+package fr.iut.sciencequest.model.dto.extensions
+
+import fr.iut.sciencequest.model.dto.question.QuestionDTO
+import fr.iut.sciencequest.model.dto.question.QuestionWithSimpleResponseDTO
+import fr.iut.sciencequest.model.metier.question.Question
+import fr.iut.sciencequest.model.metier.question.QuestionWithSimpleReponse
+
+fun QuestionDTO.ToModel(): Question {
+    return Question(
+        this.id,
+        this.question,
+        this.reponses.ToModel()
+    )
+}
+
+fun List<QuestionDTO>.ToModel(): List<Question> {
+    val liste = mutableListOf<Question>()
+    for (question in this) {
+        liste.add(question.ToModel())
+    }
+    return liste
+}
+
+fun Question.ToQuestionWithSimpleReponse(): QuestionWithSimpleReponse {
+    return QuestionWithSimpleReponse(
+        this.id,
+        this.question,
+        this.reponses.ToSimpleReponses()
+    )
+}
\ No newline at end of file
diff --git a/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/QuestionWithSimpleReponseExtension.kt b/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/QuestionWithSimpleReponseExtension.kt
new file mode 100644
index 0000000..c0587e4
--- /dev/null
+++ b/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/QuestionWithSimpleReponseExtension.kt
@@ -0,0 +1,20 @@
+package fr.iut.sciencequest.model.dto.extensions
+
+import fr.iut.sciencequest.model.dto.question.QuestionWithSimpleResponseDTO
+import fr.iut.sciencequest.model.metier.question.QuestionWithSimpleReponse
+
+fun QuestionWithSimpleResponseDTO.ToModel(): QuestionWithSimpleReponse {
+    return QuestionWithSimpleReponse(
+        this.id,
+        this.question,
+        this.reponses.ToModel()
+    )
+}
+
+fun List<QuestionWithSimpleResponseDTO>.ToModel(): List<QuestionWithSimpleReponse> {
+    val liste = ArrayList<QuestionWithSimpleReponse>()
+    for (question in this) {
+        liste.add(question.ToModel())
+    }
+    return liste
+}
\ No newline at end of file
diff --git a/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/ReponseExtension.kt b/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/ReponseExtension.kt
new file mode 100644
index 0000000..eca76bd
--- /dev/null
+++ b/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/ReponseExtension.kt
@@ -0,0 +1,37 @@
+package fr.iut.sciencequest.model.dto.extensions
+
+import fr.iut.sciencequest.model.dto.reponse.ReponseDTO
+import fr.iut.sciencequest.model.metier.reponse.Reponse
+import fr.iut.sciencequest.model.metier.reponse.ReponseSimple
+
+fun ReponseDTO.ToModel(): Reponse {
+    return Reponse(
+        this.id,
+        this.reponse,
+        this.question.ToModel(),
+        this.scientifique.ToModel()
+    )
+}
+
+fun List<ReponseDTO>.ToModel(): List<Reponse> {
+    val liste = ArrayList<Reponse>()
+    for (reponse in this) {
+        liste.add(reponse.ToModel())
+    }
+    return liste
+}
+
+fun Reponse.ToSimpleReponse(): ReponseSimple {
+    return ReponseSimple(
+        this.id,
+        this.reponse
+    )
+}
+
+fun List<Reponse>.ToSimpleReponses(): List<ReponseSimple> {
+    val liste = ArrayList<ReponseSimple>()
+    for (reponse in this) {
+        liste.add(reponse.ToSimpleReponse())
+    }
+    return liste
+}
\ No newline at end of file
diff --git a/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/SimpleReponseExtension.kt b/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/SimpleReponseExtension.kt
new file mode 100644
index 0000000..bae8326
--- /dev/null
+++ b/android/app/src/main/java/fr/iut/sciencequest/model/dto/extensions/SimpleReponseExtension.kt
@@ -0,0 +1,19 @@
+package fr.iut.sciencequest.model.dto.extensions
+
+import fr.iut.sciencequest.model.dto.reponse.ReponseSimpleDTO
+import fr.iut.sciencequest.model.metier.reponse.ReponseSimple
+
+fun ReponseSimpleDTO.ToModel(): ReponseSimple {
+    return ReponseSimple(
+        this.id,
+        this.reponse
+    )
+}
+
+fun List<ReponseSimpleDTO>.ToModel(): List<ReponseSimple> {
+    val liste = ArrayList<ReponseSimple>()
+    for (reponse in this) {
+        liste.add(reponse.ToModel())
+    }
+    return liste
+}
\ No newline at end of file