diff --git a/src/interfaces/AlgoDiffusion.java b/src/interfaces/AlgoDiffusion.java
index ec86d45..9cad9a0 100644
--- a/src/interfaces/AlgoDiffusion.java
+++ b/src/interfaces/AlgoDiffusion.java
@@ -1,4 +1,5 @@
 package interfaces;
 public interface AlgoDiffusion {
-
+public void configure();
+public void execture();
 }
diff --git a/src/interfaces/Capteur.java b/src/interfaces/Capteur.java
index 08b92d4..55dbea8 100644
--- a/src/interfaces/Capteur.java
+++ b/src/interfaces/Capteur.java
@@ -1,4 +1,7 @@
 package interfaces;
 public interface Capteur {
-
+    public void attach(Observer o);
+    public void detach(Observer o);
+    public int getValue();
+    public void tick();
 }
diff --git a/src/interfaces/Observer.java b/src/interfaces/Observer.java
index f0f4171..99da751 100644
--- a/src/interfaces/Observer.java
+++ b/src/interfaces/Observer.java
@@ -1,4 +1,4 @@
 package interfaces;
-public interface Observer {
-
+public interface Observer<T> {
+    public void update(T subject);
 }
diff --git a/src/interfaces/ObserverdeCapteur.java b/src/interfaces/ObserverdeCapteur.java
index 10d1ef1..3fb4f81 100644
--- a/src/interfaces/ObserverdeCapteur.java
+++ b/src/interfaces/ObserverdeCapteur.java
@@ -1,4 +1,6 @@
 package interfaces;
-public interface ObserverdeCapteur {
-
+public interface ObserverdeCapteur extends Observer<Capteur>{
+    
+    @Override
+    public void update(Capteur subject);
 }
diff --git a/src/interfaces/Subject.java b/src/interfaces/Subject.java
index 109c010..bec4e9d 100644
--- a/src/interfaces/Subject.java
+++ b/src/interfaces/Subject.java
@@ -1,4 +1,5 @@
 package interfaces;
 public interface Subject {
-
+    public void attach(Observer o);
+    public void detach(Observer o);
 }