diff --git a/lutin/heritage.py b/lutin/heritage.py
index 0339f99..30a0b14 100644
--- a/lutin/heritage.py
+++ b/lutin/heritage.py
@@ -130,7 +130,9 @@ class HeritageList:
 			append_to_list(self.src['src'], element.src['src'])
 			append_to_list(self.src['dynamic'], element.src['dynamic'])
 			append_to_list(self.src['static'], element.src['static'])
-
+	
+	def __repr__(self):
+		return "{HeritageList:" + str(self.list_heritage) + "}"
 
 class heritage:
 	def __init__(self, module, target):
@@ -224,5 +226,8 @@ class heritage:
 				if self.flags["c++-version"] > ver:
 					ver = self.flags["c++-version"]
 			self.flags["c++-version"] = ver
+	
+	def __repr__(self):
+		return "{Heritage:" + str(self.name) + " ... }"
 
 
diff --git a/lutin/module.py b/lutin/module.py
index d80aa6f..7354572 100644
--- a/lutin/module.py
+++ b/lutin/module.py
@@ -124,6 +124,9 @@ class Module:
 		                            }
 		self.sub_heritage_list = None
 	
+	def __repr__(self):
+		return "{lutin.Module:" + str(self.name) + "}"
+	
 	def get_type(self):
 		return self.type
 	##
diff --git a/lutin/system.py b/lutin/system.py
index 2f327a2..da4477d 100644
--- a/lutin/system.py
+++ b/lutin/system.py
@@ -47,6 +47,8 @@ class System:
 		else:
 			self.action_on_state[name_of_state].append([level, name, action])
 	
+	def __repr__(self):
+		return "{lutin.System}"