diff --git a/2020-2021/src/TD4/travel/TravelOrganizer.java b/2020-2021/src/TD4/travel/TravelOrganizer.java
index ec4c65c..11cf158 100644
--- a/2020-2021/src/TD4/travel/TravelOrganizer.java
+++ b/2020-2021/src/TD4/travel/TravelOrganizer.java
@@ -2,4 +2,10 @@ package TD4.travel;
 
 public class TravelOrganizer implements Service {
 
+	@Override
+	public Product find(Description d) {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
 }
diff --git a/2020-2021/src/TD4/travel/Trip.java b/2020-2021/src/TD4/travel/Trip.java
index aa49591..23d5690 100644
--- a/2020-2021/src/TD4/travel/Trip.java
+++ b/2020-2021/src/TD4/travel/Trip.java
@@ -1,7 +1,7 @@
 package TD4.travel;
 
 public class Trip implements Product {
-	
+
 	private Description desc;
 	
 	public Trip(Description d) {
@@ -12,10 +12,15 @@ public class Trip implements Product {
 		return .0;	
 	}
 	
-	public void addItem() {
+	public void addItem(Product p) {
 		
 	}
 
+	@Override
+	public String toString() {
+		return "Trip [desc=" + desc + "]";
+	}
+	
 	/**
 	 * @return the desc
 	 */
diff --git a/2020-2021/src/TD4/travel/travels.ucls b/2020-2021/src/TD4/travel/travels.ucls
index 40e93aa..8019af4 100644
--- a/2020-2021/src/TD4/travel/travels.ucls
+++ b/2020-2021/src/TD4/travel/travels.ucls
@@ -3,7 +3,7 @@
   associations="true" dependencies="false" nesting-relationships="true" router="FAN">  
   <class id="1" language="java" name="TD4.travel.Trip" project="M315" file="/M315/src/TD4/travel/Trip.java" 
     binary="false" corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="366" y="89"/>    
+    <position height="-1" width="-1" x="305" y="104"/>    
     <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
       sort-features="false" accessors="true" visibility="true">      
       <attributes public="true" package="true" protected="true" private="true" static="true"/>      
@@ -12,7 +12,7 @@
   </class>  
   <class id="2" language="java" name="TD4.travel.Description" project="M315" 
     file="/M315/src/TD4/travel/Description.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="589" y="243"/>    
+    <position height="-1" width="-1" x="566" y="361"/>    
     <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
       sort-features="false" accessors="true" visibility="true">      
       <attributes public="true" package="true" protected="true" private="true" static="true"/>      
@@ -21,7 +21,7 @@
   </class>  
   <interface id="3" language="java" name="TD4.travel.Product" project="M315" file="/M315/src/TD4/travel/Product.java" 
     binary="false" corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="583" y="81"/>    
+    <position height="-1" width="-1" x="532" y="103"/>    
     <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
       sort-features="false" accessors="true" visibility="true">      
       <attributes public="true" package="true" protected="true" private="true" static="true"/>      
@@ -30,7 +30,7 @@
   </interface>  
   <class id="4" language="java" name="TD4.travel.TravelOrganizer" project="M315" 
     file="/M315/src/TD4/travel/TravelOrganizer.java" binary="false" corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="84" y="91"/>    
+    <position height="-1" width="-1" x="99" y="108"/>    
     <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
       sort-features="false" accessors="true" visibility="true">      
       <attributes public="true" package="true" protected="true" private="true" static="true"/>      
@@ -39,7 +39,7 @@
   </class>  
   <interface id="5" language="java" name="TD4.travel.Service" project="M315" file="/M315/src/TD4/travel/Service.java" 
     binary="false" corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="101" y="391"/>    
+    <position height="-1" width="-1" x="93" y="387"/>    
     <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
       sort-features="false" accessors="true" visibility="true">      
       <attributes public="true" package="true" protected="true" private="true" static="true"/>      
@@ -47,13 +47,13 @@
     </display>  
   </interface>  
   <realization id="6">    
-    <end type="SOURCE" refId="1"/>    
-    <end type="TARGET" refId="3"/>  
-  </realization>  
-  <realization id="7">    
     <end type="SOURCE" refId="4"/>    
     <end type="TARGET" refId="5"/>  
   </realization>  
+  <realization id="7">    
+    <end type="SOURCE" refId="1"/>    
+    <end type="TARGET" refId="3"/>  
+  </realization>  
   <classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
     sort-features="false" accessors="true" visibility="true">    
     <attributes public="true" package="true" protected="true" private="true" static="true"/>