diff --git a/be-graphes-model/src/main/java/org/insa/graphs/model/Path.java b/be-graphes-model/src/main/java/org/insa/graphs/model/Path.java
index 1d84e84..7d7e2d2 100644
--- a/be-graphes-model/src/main/java/org/insa/graphs/model/Path.java
+++ b/be-graphes-model/src/main/java/org/insa/graphs/model/Path.java
@@ -201,8 +201,26 @@ public class Path {
      * @deprecated Need to be implemented.
      */
     public boolean isValid() {
-        // TODO:
-        return false;
+        
+        boolean retour = false;
+
+        if (isEmpty() || this.size() == 1) {
+            retour = true;
+        } else {
+            retour = true;
+            if (this.getOrigin() == this.arcs.get(0).getOrigin()) {
+                for (int j = 0 ; j < arcs.size() - 2 ; j++) {
+                    if (!(arcs.get(j).getDestination() == arcs.get(j+1).getOrigin())) {
+                        retour = false;
+                    }
+                }
+            }
+            else {
+                retour = false;
+            }
+        }
+
+        return retour;
     }
 
     /**