diff --git a/Sources/Model/Class1.cs b/Sources/Model/Class1.cs
index 34183dd..c9dd8cb 100644
--- a/Sources/Model/Class1.cs
+++ b/Sources/Model/Class1.cs
@@ -1,7 +1,14 @@
-namespace Model
-{
-    public class Class1
-    {
-
-    }
-}
\ No newline at end of file
+
+
+using System Text;
+using System Threading Tasks;
+
+
+namespace Model
+{
+	public interface IDataManager
+	{
+		IEnumerable<Groupe> RecupererGroupe();
+		IEnumerable<Etudiant> RecupererEtudiant();
+	}
+}