diff --git a/CMakeLists.txt b/CMakeLists.txt
index f358df6..9c3a1e3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,4 +4,4 @@ project(LO41 C)
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
 
-add_executable(LO41 main.c List/List.h List/List.c Objects.h List/Element.c List/Element.h Objects.c Building/Building.c Building/Building.h Elevator/Elevator.c Elevator/Elevator.h CommunicationBox/CommunicationBox.c CommunicationBox/CommunicationBox.h)
\ No newline at end of file
+add_executable(LO41 main.c List/List.h List/List.c Objects.h List/Element.c List/Element.h Objects.c Building/Building.c Building/Building.h Elevator/Elevator.c Elevator/Elevator.h CommunicationBox/CommunicationBox.c CommunicationBox/CommunicationBox.h SharedData/SharedData.c SharedData/SharedData.h)
\ No newline at end of file
diff --git a/Objects.h b/Objects.h
index c9dee21..671bd9e 100644
--- a/Objects.h
+++ b/Objects.h
@@ -9,6 +9,7 @@
 #include <stdlib.h>
 
 #define NEW(type, ...) _init_##type(__VA_ARGS__)
+#define GET_INSTANCE(type, ...) _get_instance_##type(__VA_ARGS__)
 #define DELETE(obj) obj->_free_(obj)
 #define DESTRUCTOR(type) void (*_free_)(struct o_##type *this)
 #define THIS(type) type *this
diff --git a/SharedData/SharedData.c b/SharedData/SharedData.c
new file mode 100644
index 0000000..83bd97d
--- /dev/null
+++ b/SharedData/SharedData.c
@@ -0,0 +1,18 @@
+//
+// Created by Antoine Bartuccio on 06/06/2018.
+//
+
+#include "SharedData.h"
+
+void _free__SharedData(THIS(SharedData)){
+	free(this);
+}
+
+SharedData *_get_instance_SharedData(){
+	static SharedData * new_shared_data = NULL;
+	if (new_shared_data == NULL){
+		new_shared_data = malloc_or_die(sizeof(SharedData));
+		LINK(SharedData, new_shared_data, _free_);
+	}
+	return new_shared_data;
+}
diff --git a/SharedData/SharedData.h b/SharedData/SharedData.h
new file mode 100644
index 0000000..b987897
--- /dev/null
+++ b/SharedData/SharedData.h
@@ -0,0 +1,17 @@
+//
+// Created by Antoine Bartuccio on 06/06/2018.
+//
+
+#ifndef LO41_SHAREDDATA_H
+#define LO41_SHAREDDATA_H
+
+#include "../Objects.h"
+
+typedef struct o_SharedData {
+
+	DESTRUCTOR(SharedData);
+} SharedData;
+
+SharedData *_get_instance_SharedData();
+
+#endif //LO41_SHAREDDATA_H
diff --git a/main.c b/main.c
index 5d322aa..fb2d757 100644
--- a/main.c
+++ b/main.c
@@ -2,11 +2,15 @@
 #include "Objects.h"
 #include "List/List.h"
 #include "Building/Building.h"
+#include "SharedData/SharedData.h"
 
 int main() {
 	List *l = NEW(List);
 	char text1[30] = "Patate";
 	char text2[30] = "Patator";
+
+	GET_INSTANCE(SharedData);
+
 	printf("La taille est de %d\n", l->get_size(l));
 	l->insert_tail(l, text1, sizeof(char) * 30);
 	l->insert_head(l, text2, sizeof(char) * 30);
@@ -28,5 +32,6 @@ int main() {
 	DELETE(main_building);
 
 	printf("Hello, World!\n");
+	DELETE(GET_INSTANCE(SharedData));
 	return 0;
 }
\ No newline at end of file