diff --git a/Building/Building.c b/Building/Building.c
index 1075032..fcabb1a 100644
--- a/Building/Building.c
+++ b/Building/Building.c
@@ -135,6 +135,13 @@ void _free__Building(THIS(Building)){
 	free(this);
 }
 
+/**
+ * Tries to make @passenger enter an elevator, passenger being at @current_floor
+ * @THIS(Building)
+ * @current_floor the floor where the passenger is trying to enter the elevator
+ * @passenger the passenger to put in the elevator
+ * @returns an elevator number ( between 0 and ELEVATOR_NB - 1, inclusive ), -1 if no elevator was found ready to accept the passenger
+ */
 int get_inside_elevator_Building(THIS(Building), int current_floor, Passenger passenger){
 	int i;
 	/* Make assumption that a waiting elevator is not full */
@@ -143,8 +150,8 @@ int get_inside_elevator_Building(THIS(Building), int current_floor, Passenger pa
 	for (i=0; i<ELEVATOR_NB; i++){
 		if (this->elevators[i]->can_get_inside(this->elevators[i], current_floor)){
 			/* pour faire taire le compilateur le temps que je revienne sur cette fonction */
-			if (passenger.type == VISITOR)
-				this->elevators[i]->add_passenger(this->elevators[i], passenger);
+			//if (passenger.type == VISITOR) TODO : ???
+			this->elevators[i]->add_passenger(this->elevators[i], passenger);
 			/* Il faut faire des trucs ici */
 			pthread_mutex_unlock(this->mutex_func_get_inside_elevator);
 			return i;
@@ -162,20 +169,29 @@ void go_to_floor_Building(THIS(Building), int origin, int destination, Passenger
 
 	pthread_cond_wait(this->condition_floors[origin], this->mutex_cond_get_inside_elevator);
 	elevator_number = this->get_inside_elevator(this, origin, passenger);
-	if (passenger.type == RESIDENT)
-		printf("Le résident %s rentre dans l'ascenseur %s depuis l'étage %d\n", passenger.resident->name,
-			   this->elevators[elevator_number]->name, origin);
-	else if (passenger.type == VISITOR)
-		printf("Le visiteur %s rentre dans l'ascenseur %s depuis l'étage %d\n", passenger.visitor->name,
-			   this->elevators[elevator_number]->name, origin);
 
-	pthread_cond_wait(this->condition_floors[destination], this->mutex_cond_get_outside_elevator);
-	if (passenger.type == RESIDENT)
-		printf("Le résident %s sors de l'ascenseur %s à l'étage %d\n", passenger.resident->name,
-			   this->elevators[elevator_number]->name, destination);
-	else if (passenger.type == VISITOR)
-		printf("Le visiteur %s sors de l'ascenseur %s à l'étage %d\n", passenger.visitor->name,
-			   this->elevators[elevator_number]->name, destination);
+	if (elevator_number != -1){ //passenger accepted in elevator
+		if (passenger.type == RESIDENT)
+			printf("Le résident %s rentre dans l'ascenseur %s depuis l'étage %d\n", passenger.resident->name,
+			       this->elevators[elevator_number]->name, origin);
+		else if (passenger.type == VISITOR)
+			printf("Le visiteur %s rentre dans l'ascenseur %s depuis l'étage %d\n", passenger.visitor->name,
+			       this->elevators[elevator_number]->name, origin);
+
+		pthread_cond_wait(this->condition_floors[destination], this->mutex_cond_get_outside_elevator);
+		if (passenger.type == RESIDENT)
+			printf("Le résident %s sort de l'ascenseur %s à l'étage %d\n", passenger.resident->name,
+			       this->elevators[elevator_number]->name, destination);
+		else if (passenger.type == VISITOR)
+			printf("Le visiteur %s sort de l'ascenseur %s à l'étage %d\n", passenger.visitor->name,
+			       this->elevators[elevator_number]->name, destination);	
+	}else{
+		if (passenger.type == RESIDENT)
+		        printf("Le résident %s à l'étage %d n'a pas pu rentrer dans un ascenseur. Préempté !\n", passenger.resident->name, origin);
+		else if (passenger.type == VISITOR)
+		        printf("Le visiteur %s à l'étage %d n'a pas pu rentrer dans un ascenseur. Préempté !\n", passenger.visitor->name, origin);
+	}//todo : else, remettre en attente ?
+	
 }
 
 int use_call_box_Building(THIS(Building), char * resident_name){
@@ -239,4 +255,4 @@ Building *_init_Building(char * residents_file, char * visitors_file){
 		new_building->parse_visitors(new_building, visitors_file);
 
 	return new_building;
-}
\ No newline at end of file
+}
diff --git a/Elevator/Elevator.c b/Elevator/Elevator.c
index cdb4715..c8d3538 100644
--- a/Elevator/Elevator.c
+++ b/Elevator/Elevator.c
@@ -109,8 +109,11 @@ void *runnable_Elevator(void * void_this){
 	AGENT_OPTIONS
 
 	printf("Je suis l'ascenseur %s\n", this->name);
-	for (;;)
+	for (;;){
 		data->main_building->signal_elevator_at_floor(data->main_building, this->get_floor(this));
+		this->set_floor(this, this->get_next_floor(this));
+	}
+
 	return NULL;
 }