diff --git a/2020-2021/src/TD4/travel/Description.java b/2020-2021/src/TD4/travel/Description.java
new file mode 100644
index 0000000..e9807e2
--- /dev/null
+++ b/2020-2021/src/TD4/travel/Description.java
@@ -0,0 +1,65 @@
+package TD4.travel;
+
+import java.time.LocalDate;
+
+public class Description {
+
+	private LocalDate departDate;
+	private String departPlace;
+	private String arrivalPlace;
+	private int duration;
+	
+	public Description( ) {
+		
+	}
+	
+	/**
+	 * @return the departDate
+	 */
+	public LocalDate getDepartDate() {
+		return departDate;
+	}
+	/**
+	 * @param departDate the departDate to set
+	 */
+	public void setDepartDate(LocalDate departDate) {
+		this.departDate = departDate;
+	}
+	/**
+	 * @return the departPlace
+	 */
+	public String getDepartPlace() {
+		return departPlace;
+	}
+	/**
+	 * @param departPlace the departPlace to set
+	 */
+	public void setDepartPlace(String departPlace) {
+		this.departPlace = departPlace;
+	}
+	/**
+	 * @return the arrivalPlace
+	 */
+	public String getArrivalPlace() {
+		return arrivalPlace;
+	}
+	/**
+	 * @param arrivalPlace the arrivalPlace to set
+	 */
+	public void setArrivalPlace(String arrivalPlace) {
+		this.arrivalPlace = arrivalPlace;
+	}
+	/**
+	 * @return the duration
+	 */
+	public int getDuration() {
+		return duration;
+	}
+	/**
+	 * @param duration the duration to set
+	 */
+	public void setDuration(int duration) {
+		this.duration = duration;
+	}
+	
+}
diff --git a/2020-2021/src/TD4/travel/Product.java b/2020-2021/src/TD4/travel/Product.java
new file mode 100644
index 0000000..f03b264
--- /dev/null
+++ b/2020-2021/src/TD4/travel/Product.java
@@ -0,0 +1,5 @@
+package TD4.travel;
+
+public interface Product {
+	public double getPrice();
+}
diff --git a/2020-2021/src/TD4/travel/Service.java b/2020-2021/src/TD4/travel/Service.java
new file mode 100644
index 0000000..9e33ab7
--- /dev/null
+++ b/2020-2021/src/TD4/travel/Service.java
@@ -0,0 +1,5 @@
+package TD4.travel;
+
+public interface Service {
+	public Product find(Description d);
+}
diff --git a/2020-2021/src/TD4/travel/TravelOrganizer.java b/2020-2021/src/TD4/travel/TravelOrganizer.java
new file mode 100644
index 0000000..ec4c65c
--- /dev/null
+++ b/2020-2021/src/TD4/travel/TravelOrganizer.java
@@ -0,0 +1,5 @@
+package TD4.travel;
+
+public class TravelOrganizer implements Service {
+
+}
diff --git a/2020-2021/src/TD4/travel/Trip.java b/2020-2021/src/TD4/travel/Trip.java
new file mode 100644
index 0000000..aa49591
--- /dev/null
+++ b/2020-2021/src/TD4/travel/Trip.java
@@ -0,0 +1,32 @@
+package TD4.travel;
+
+public class Trip implements Product {
+	
+	private Description desc;
+	
+	public Trip(Description d) {
+		this.setDesc(d);
+	}
+	
+	public double getPrice() {
+		return .0;	
+	}
+	
+	public void addItem() {
+		
+	}
+
+	/**
+	 * @return the desc
+	 */
+	public Description getDesc() {
+		return desc;
+	}
+
+	/**
+	 * @param desc the desc to set
+	 */
+	public void setDesc(Description desc) {
+		this.desc = desc;
+	}
+}
diff --git a/2020-2021/src/TD4/travel/travels.ucls b/2020-2021/src/TD4/travel/travels.ucls
new file mode 100644
index 0000000..40e93aa
--- /dev/null
+++ b/2020-2021/src/TD4/travel/travels.ucls
@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<class-diagram version="1.2.4" icons="true" always-add-relationships="false" generalizations="true" realizations="true" 
+  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"/>    
+    <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"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </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"/>    
+    <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"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </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"/>    
+    <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"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </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"/>    
+    <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"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </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"/>    
+    <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"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </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>  
+  <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"/>    
+    <operations public="true" package="true" protected="true" private="true" static="true"/>  
+  </classifier-display>  
+  <association-display labels="true" multiplicity="true"/>
+</class-diagram>
\ No newline at end of file