diff --git a/flap/src/hopix/hopixInterpreter.ml b/flap/src/hopix/hopixInterpreter.ml
index 1695c1e..ad4e961 100644
--- a/flap/src/hopix/hopixInterpreter.ml
+++ b/flap/src/hopix/hopixInterpreter.ml
@@ -385,7 +385,7 @@ and expression' environment memory e =
     E, M ⊢ e ⇓ v, M'
 
     and E = [runtime.environment], M = [runtime.memory]. *)
-and expression _pos environment memory = function
+and expression pos environment memory = function
   | Literal l -> literal_expression l.value
 
   | Variable (id, _) ->
@@ -393,28 +393,27 @@ and expression _pos environment memory = function
     Environment.lookup id.position id.value environment
 
   | Tagged(constructor,_,list_t) -> (* On ignore le type car on interprète *)
-    (* TODO *)
     VTagged(constructor.value, List.map(expression' environment memory) list_t)
 
-  | Record(labels,_) -> (*
-    VRecord(List.map((label_gvalue_pair environment memory) labels))*)
-    failwith ("oui")
+  | Record(labels,_) -> 
+    VRecord(List.map((pair_labels_gvalue) (environment) (memory)) labels)
 
-  | Field(expr,label,_) -> (* On ignore la liste de type *)
-  field_value expr label environment memory 
+  | Field(expr,label,_) -> field_value expr label environment memory 
+(* On ignore la liste de type *)
 
   | Tuple [] ->
     (* Cas pour le Tuple vide
      * Un tuple vide ne contient rien (logique), donc on utilise un VUnit*)
     VUnit
   | Tuple list_exp -> VTuple (List.map (expression' environment memory) list_exp)
+    
+  (*Sequence : on evalue chaque expression, puis on récupère la dernière à avoir été évalué.
+     Le dernier élément se trouve facilement en faisant un reverse de liste et en récupérant la tête. *)
   | Sequence(list_expr) -> (let vs = List.map (expression' environment memory) list_expr in List.hd (List.rev vs))
 
   | Define(value_def,expr) ->
-    (*
-    let new_runtime = environment memory value_def in 
-    expression' (new_runtime.environment new_runtime.memory expr)*)
-    failwith("TODO")
+    let runtime = value_definition { environment; memory} value_def in 
+    expression' runtime.environment runtime.memory expr
 
   | Fun (FunctionDefinition(pattern,expr)) -> VClosure(environment, pattern, expr)
 
@@ -424,9 +423,9 @@ and expression _pos environment memory = function
     let dref = expression' environment memory ref in
     VLocation (Memory.allocate memory Mint.one dref)
 
-  | Assign _ ->
-    (* TODO *)
-    failwith "Students! This is your job (Assign)!"
+  | Assign(expr1,expr2) -> (*assign_value expr1 expr2 environment memory*)
+  failwith ("todo")
+
   | Read read ->
     let loc = value_as_location (expression' environment memory read) in
     (match loc with
@@ -435,26 +434,56 @@ and expression _pos environment memory = function
   | Case(expr,branch) -> (*case_value expr branch environment memory*)
     (* TODO *)
     failwith "Students! This is your job (Case)!"
+
   | IfThenElse(expr1,expr2,expr3) -> if_then_else_value expr1 expr2 expr3 environment memory
-  | While _ ->
-    (* TODO *)
-    failwith "Students! This is your job (While)!"
+
+  | While(expr1,expr2) -> while_value expr1 expr2 environment memory pos
+
   | For _ ->
     (* TODO *)
     failwith "Students! This is your job (For)!"
-  | TypeAnnotation _ ->
+
+  | TypeAnnotation _ -> VUnit
     (* On ignore le type car on interprète *)
-    VUnit
   
     (* TODO a finir (à commencer plutôt)
 and case_value expr branch environment memory =
   let v = expression' environment memory expr in *)
 
+  (* Assign *)
+  (* On commence par récupérer l'évaluation de expr1, qui correspond à la valeur à laquelle est affecté expr2*)
+
+(*  and assign_value expr1 expr2 environment memory =
+  let vall = expression' environment memory expr1 in
+
+  (* On regarde ensuite si*)
+  match value_as_location vall with 
+
+  (*TODO : corriger le bug unit*)
+  | None -> failwith "erreur"
+  | Some(v) -> 
+  (let value = expression' environment memory expr2 in 
+  let mem = Memory.dereference(memory) (v) in
+  Memory.write (mem) Mint.zero (value))
+*)
+and pair_labels_gvalue environment memory (lab, expr) =
+  (Position.value lab, expression' environment memory expr)
+
+and while_value expr1 expr2 environment memory pos =
+  let cond = expression' environment memory expr1 in (* On récupère la valeur de la condition *)
+  match value_as_bool cond with 
+  | true -> 
+    let expr' = expression' environment memory expr2 in
+    expression pos environment memory (While(expr1,expr2))
+  | false -> VUnit
+
+
 and if_then_else_value expr1 expr2 expr3 environment memory =
   let cond = expression' environment memory expr1 in (* On récupère la valeur de la condition *)
-  if value_as_bool cond = true then 
-    expression' environment memory expr2 else (* SI c'est true, alors on évalue la première expression*)
-      expression' environment memory expr3 (* sinon la deuxième *)
+  match value_as_bool cond with 
+  | true -> expression' environment memory expr2
+    (* SI c'est true, alors on évalue la première expression*)
+  | false -> expression' environment memory expr3 (* sinon la deuxième *)