diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/AStarAlgorithm.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/AStarAlgorithm.java
index fd172f0..1394c6c 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/AStarAlgorithm.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/AStarAlgorithm.java
@@ -1,9 +1,14 @@
 package org.insa.graphs.algorithm.shortestpath;
 
-public class AStarAlgorithm extends DijkstraAlgorithm {
+import org.insa.graphs.model.Node;
 
+public class AStarAlgorithm extends DijkstraAlgorithm {
     public AStarAlgorithm(ShortestPathData data) {
         super(data);
     }
 
-}
+    @Override
+    protected Label createLabel(Node node, ShortestPathData data) {
+        return new LabelStar(node, data.getDestination());
+    }
+}
\ No newline at end of file
diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java
index 5d35836..fa6293b 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/DijkstraAlgorithm.java
@@ -2,7 +2,6 @@ package org.insa.graphs.algorithm.shortestpath;
 
 import java.util.ArrayList;
 import java.util.Collections;
-
 import org.insa.graphs.algorithm.AbstractSolution.Status;
 import org.insa.graphs.algorithm.utils.BinaryHeap;
 import org.insa.graphs.model.Arc;
@@ -11,80 +10,68 @@ import org.insa.graphs.model.Node;
 import org.insa.graphs.model.Path;
 
 public class DijkstraAlgorithm extends ShortestPathAlgorithm {
-
     public DijkstraAlgorithm(ShortestPathData data) {
         super(data);
     }
 
+    protected Label createLabel(Node node, ShortestPathData data) {
+        return new Label(node);
+    }
+
     @Override
     protected ShortestPathSolution doRun() {
-
         // retrieve data from the input problem (getInputData() is inherited from the
         // parent class ShortestPathAlgorithm)
         final ShortestPathData data = getInputData();
-
         // variable that will contain the solution of the shortest path problem
         ShortestPathSolution solution = null;
-
         Graph graph = data.getGraph();
         final int nbNodes = graph.size();
-
-       
-       //Remplir le tableau
-        Label[] labels=new Label[nbNodes];
-        for (Node node:graph.getNodes()){
-            labels[node.getId()]=new Label(node);
-
-
+        // Cas special : origine == destination
+        if (data.getOrigin().getId() == data.getDestination().getId()) {
+            return new ShortestPathSolution(data, Status.OPTIMAL, new Path(graph, data.getOrigin()));
+        }
+        // Remplir le tableau
+        Label[] labels = new Label[nbNodes];
+        for (Node node : graph.getNodes()) {
+            labels[node.getId()] = createLabel(node, data);
+        }
+        BinaryHeap<Label> tas = new BinaryHeap<>();
+        labels[data.getOrigin().getId()].setCoutRealise(0);
+        notifyOriginProcessed(data.getOrigin());
+        tas.insert(labels[data.getOrigin().getId()]);
+        while (!tas.isEmpty()) {
+            Label labelMin = tas.deleteMin();
+            labelMin.setMarque();
+            notifyNodeMarked(labelMin.getSommetCourant());
+            if (labelMin.getSommetCourant().equals(data.getDestination())) {
+                break;
             }
-
-            BinaryHeap<Label> tas=new BinaryHeap<>();
-            labels[data.getOrigin().getId()].setCoutRealise(0);
-            tas.insert(labels[data.getOrigin().getId()]);
-            
-            while(!tas.isEmpty()){
-                Label labelMin=tas.deleteMin();
-                labelMin.setMarque();
-
-                if (labelMin.getSommetCourant().equals(data.getDestination())){
-                    break;
-                }
-
             for (Arc arc : labelMin.getSommetCourant().getSuccessors()) {
-                if (!data.isAllowed(arc)) continue;
-
+                if (!data.isAllowed(arc))
+                    continue;
                 Label labelSucc = labels[arc.getDestination().getId()];
-
                 if (!labelSucc.isMarque()) {
                     double nouveauCout = labelMin.getCoutRealise() + data.getCost(arc);
-
                     if (nouveauCout < labelSucc.getCoutRealise()) {
                         boolean dejaDansTas = Double.isFinite(labelSucc.getCoutRealise());
-
-
-
                         if (dejaDansTas) {
-                            tas.remove(labelSucc);  
+                            tas.remove(labelSucc);
                         } else {
                             notifyNodeReached(arc.getDestination());
                         }
-			labelSucc.setCoutRealise(nouveauCout);
+                        labelSucc.setCoutRealise(nouveauCout);
                         labelSucc.setPere(arc);
-
-
                         tas.insert(labelSucc);
                     }
                 }
             }
-        }   
-       
-       
-       // Construction de la solution
+        }
+        // Construction de la solution
         if (labels[data.getDestination().getId()].getPere() == null) {
             solution = new ShortestPathSolution(data, Status.INFEASIBLE);
         } else {
             notifyDestinationReached(data.getDestination());
-
             ArrayList<Arc> arcs = new ArrayList<>();
             Arc arc = labels[data.getDestination().getId()].getPere();
             while (arc != null) {
@@ -94,9 +81,6 @@ public class DijkstraAlgorithm extends ShortestPathAlgorithm {
             Collections.reverse(arcs);
             solution = new ShortestPathSolution(data, Status.OPTIMAL, new Path(graph, arcs));
         }
-
         return solution;
-    
     }
-
-}
+}
\ No newline at end of file
diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java
index a3ef8da..c03c6c5 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/Label.java
@@ -3,55 +3,53 @@ package org.insa.graphs.algorithm.shortestpath;
 import org.insa.graphs.model.Arc;
 import org.insa.graphs.model.Node;
 
-
-
-public class Label implements Comparable<Label>{
-
-
+public class Label implements Comparable<Label> {
     private Node sommetCourant;
     private boolean marque;
     private double coutRealise;
     private Arc pere;
 
     public Label(Node sommetCourant) {
-        this.sommetCourant=sommetCourant;
-        this.marque=false;
-
-        this.coutRealise=Double.POSITIVE_INFINITY;
-        this.pere=null;
-
-}
-
-public Node getSommetCourant(){
-    return this.sommetCourant;
-
-}
-public boolean isMarque(){
-    return this.marque;
+        this.sommetCourant = sommetCourant;
+        this.marque = false;
+        this.coutRealise = Double.POSITIVE_INFINITY;
+        this.pere = null;
     }
-public double getCoutRealise(){
-    return this.coutRealise;
-}
-public Arc getPere(){
-    return this.pere;
-}
-public void setMarque(){
-    this.marque=true;
-}
-public void setCoutRealise(double coutRealise){
-    this.coutRealise=coutRealise;
 
-}
-public void setPere(Arc pere){
-    this.pere=pere;
-}
-public double getCost(){
-    return this.coutRealise;
-}
+    public Node getSommetCourant() {
+        return this.sommetCourant;
+    }
 
-@Override
-public int compareTo(Label other){
-return Double.compare(this.getCost(), other.getCost());
+    public boolean isMarque() {
+        return this.marque;
+    }
 
-}
-}
+    public double getCoutRealise() {
+        return this.coutRealise;
+    }
+
+    public Arc getPere() {
+        return this.pere;
+    }
+
+    public void setMarque() {
+        this.marque = true;
+    }
+
+    public void setCoutRealise(double coutRealise) {
+        this.coutRealise = coutRealise;
+    }
+
+    public void setPere(Arc pere) {
+        this.pere = pere;
+    }
+
+    public double getTotalCost() {
+        return this.coutRealise;
+    }
+
+    @Override
+    public int compareTo(Label other) {
+        return Double.compare(this.getTotalCost(), other.getTotalCost());
+    }
+}
\ No newline at end of file
diff --git a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/LabelStar.java b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/LabelStar.java
index b21357f..7aab97a 100644
--- a/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/LabelStar.java
+++ b/be-graphes-algos/src/main/java/org/insa/graphs/algorithm/shortestpath/LabelStar.java
@@ -1,12 +1,30 @@
-//import org.insa.graphs.model.Arc;
-//import org.insa.graphs.model.Node;
+package org.insa.graphs.algorithm.shortestpath;
 
+import org.insa.graphs.model.Node;
 
+public class LabelStar extends Label {
+    private final double heuristique;
 
-//package org.insa.graphs.algorithm.shortestpath;
+    public LabelStar(Node sommetCourant, Node destination) {
+        super(sommetCourant);
+        this.heuristique = sommetCourant.getPoint().distanceTo(destination.getPoint());
+    }
 
-//import org.insa.graphs.model.Arc;
+    public double getHeuristique() {
+        return this.heuristique;
+    }
 
-//blic class LabelStar extends Label 
-    //ublic LabelStar()
+    @Override
+    public double getTotalCost() {
+        return this.getCoutRealise() + this.heuristique;
+    }
 
+    @Override
+    public int compareTo(Label other) {
+        int cmp = Double.compare(this.getTotalCost(), other.getTotalCost());
+        if (cmp == 0 && other instanceof LabelStar) {
+            return Double.compare(this.heuristique, ((LabelStar) other).heuristique);
+        }
+        return cmp;
+    }
+}
\ No newline at end of file
diff --git a/be-graphes-gui/src/main/java/org/insa/graphs/gui/simple/Launch.java b/be-graphes-gui/src/main/java/org/insa/graphs/gui/simple/Launch.java
index aa7ea04..2491f90 100644
--- a/be-graphes-gui/src/main/java/org/insa/graphs/gui/simple/Launch.java
+++ b/be-graphes-gui/src/main/java/org/insa/graphs/gui/simple/Launch.java
@@ -5,15 +5,17 @@ import java.awt.Dimension;
 import java.io.BufferedInputStream;
 import java.io.DataInputStream;
 import java.io.FileInputStream;
-
 import javax.swing.JFrame;
 import javax.swing.SwingUtilities;
-
+import org.insa.graphs.algorithm.ArcInspectorFactory;
+import org.insa.graphs.algorithm.AbstractSolution.Status;
+import org.insa.graphs.algorithm.shortestpath.*;
 import org.insa.graphs.gui.drawing.Drawing;
 import org.insa.graphs.gui.drawing.components.BasicDrawing;
 import org.insa.graphs.model.Graph;
 import org.insa.graphs.model.Path;
 import org.insa.graphs.model.io.BinaryGraphReader;
+import org.insa.graphs.model.io.BinaryPathReader;
 import org.insa.graphs.model.io.GraphReader;
 import org.insa.graphs.model.io.PathReader;
 
@@ -42,38 +44,176 @@ public class Launch {
         return basicDrawing;
     }
 
-    public static void main(String[] args) throws Exception {
+    // Un scenario est defini par une carte, un filtre, une origine, une destination
+    // et optionnellement un fichier .path de reference pour valider le resultat
+    static class Scenario {
+        final String carte;
+        final String cheminRef;
+        final int filtre;
+        final int origine, destination;
+        final String description;
 
-        // visit these directory to see the list of available files on commetud.
-        final String mapName =
-                "/mnt/commetud/3eme Annee MIC/Graphes-et-Algorithmes/Maps/insa.mapgr";
-        final String pathName =
-                "/mnt/commetud/3eme Annee MIC/Graphes-et-Algorithmes/Paths/path_fr31insa_rangueil_r2.path";
-
-        final Graph graph;
-        final Path path;
-
-        // create a graph reader
-        try (final GraphReader reader = new BinaryGraphReader(new DataInputStream(
-                new BufferedInputStream(new FileInputStream(mapName))))) {
-
-            // TODO: read the graph
-            graph = null;
+        Scenario(String carte, String cheminRef, int filtre,
+                 int origine, int destination, String description) {
+            this.carte       = carte;
+            this.cheminRef   = cheminRef;
+            this.filtre      = filtre;
+            this.origine     = origine;
+            this.destination = destination;
+            this.description = description;
         }
-
-        // create the drawing
-        final Drawing drawing = createDrawing();
-
-        // TODO: draw the graph on the drawing
-
-        // TODO: create a path reader
-        try (final PathReader pathReader = null) {
-
-            // TODO: read the path
-            path = null;
-        }
-
-        // TODO: draw the path on the drawing
     }
 
-}
+    // Lance Dijkstra, A* et Bellman-Ford sur un scenario et affiche les resultats
+    public static Graph testerScenario(Scenario sc) throws Exception {
+        System.out.println("\n=== " + sc.description + " ===");
+
+        // create a graph reader
+        Graph graph;
+        try (final GraphReader reader = new BinaryGraphReader(
+                new DataInputStream(new BufferedInputStream(
+                        new FileInputStream(sc.carte))))) {
+            graph = reader.read();
+        }
+
+        ShortestPathData data = new ShortestPathData(
+                graph,
+                graph.get(sc.origine),
+                graph.get(sc.destination),
+                ArcInspectorFactory.getAllFilters().get(sc.filtre)
+        );
+
+        // On lance les trois algorithmes
+        ShortestPathSolution solDijkstra = new DijkstraAlgorithm(data).run();
+        ShortestPathSolution solAstar    = new AStarAlgorithm(data).run();
+        ShortestPathSolution solBellman  = new BellmanFordAlgorithm(data).run();
+
+        // Affichage des statuts
+        System.out.println("Dijkstra : " + solDijkstra.getStatus());
+        System.out.println("A*       : " + solAstar.getStatus());
+        System.out.println("Bellman  : " + solBellman.getStatus());
+
+        boolean estTemps = (sc.filtre == 2 || sc.filtre == 3);
+
+        if (solDijkstra.getStatus() == Status.OPTIMAL) {
+            Path pd = solDijkstra.getPath();
+            Path pa = solAstar.getPath();
+
+            // Verification que les chemins sont valides
+            System.out.println("Dijkstra chemin valide : " + pd.isValid());
+            System.out.println("A* chemin valide       : " + pa.isValid());
+
+            // Calcul des couts selon le mode distance ou temps
+            double coutDijkstra = estTemps ? pd.getMinimumTravelTime() : pd.getLength();
+            double coutAstar    = estTemps ? pa.getMinimumTravelTime() : pa.getLength();
+
+            System.out.printf("Cout Dijkstra : %.3f%n", coutDijkstra);
+            System.out.printf("Cout A*       : %.3f%n", coutAstar);
+
+            // Verification que Dijkstra et A* donnent le meme cout
+            double seuil = 1e-2;
+            System.out.println("Dijkstra == A* : "
+                    + (Math.abs(coutDijkstra - coutAstar) < seuil));
+
+            // Bellman peut etre inutilisable sur les grands graphes ou origine==destination
+            if (solBellman.getStatus() == Status.OPTIMAL) {
+                Path pb = solBellman.getPath();
+                double coutBellman = estTemps
+                        ? pb.getMinimumTravelTime()
+                        : pb.getLength();
+                System.out.printf("Cout Bellman  : %.3f%n", coutBellman);
+                System.out.println("Dijkstra == Bellman : "
+                        + (Math.abs(coutDijkstra - coutBellman) < seuil));
+            } else {
+                System.out.println("Bellman : inutilisable sur ce scenario");
+            }
+
+            // Verification par rapport au fichier .path de reference si disponible
+            if (sc.cheminRef != null) {
+                Path cheminAttendu;
+                try (final PathReader pathReader = new BinaryPathReader(
+                        new DataInputStream(new BufferedInputStream(
+                                new FileInputStream(sc.cheminRef))))) {
+                    cheminAttendu = pathReader.readPath(graph);
+                }
+                double coutRef = estTemps
+                        ? cheminAttendu.getMinimumTravelTime()
+                        : cheminAttendu.getLength();
+                System.out.printf("Cout reference : %.3f%n", coutRef);
+                System.out.println("Dijkstra == reference : "
+                        + (Math.abs(coutDijkstra - coutRef) < seuil));
+            }
+        }
+        return graph;
+    }
+
+    public static void main(String[] args) throws Exception {
+        // visit these directory to see the list of available files on commetud.
+        final String maps  = "/mnt/commetud/3eme Annee MIC/Graphes-et-Algorithmes/Maps/";
+        final String paths = "/mnt/commetud/3eme Annee MIC/Graphes-et-Algorithmes/Paths/";
+
+        Scenario[] scenarios = {
+            // Chemin de longueur nulle : origine == destination
+            new Scenario(maps + "insa.mapgr", null, 0, 552, 552,
+                    "Longueur nulle - origine == destination"),
+            // Trajet court en distance sans filtre
+            new Scenario(maps + "insa.mapgr",
+                    paths + "path_fr31insa_rangueil_r2.path",
+                    0, 552, 526,
+                    "Court trajet en distance - insa"),
+            // Meme trajet en temps
+            new Scenario(maps + "insa.mapgr", null, 2, 552, 526,
+                    "Court trajet en temps - insa"),
+            // Trajet INSA -> Bikini voiture (ne doit pas passer par le canal)
+            new Scenario(maps + "toulouse.mapgr", null, 1, 14531, 5910,
+                    "INSA -> Bikini en voiture"),
+            // Trajet INSA -> Bikini pietonne
+            new Scenario(maps + "toulouse.mapgr", null, 3, 14531, 5910,
+                    "INSA -> Bikini pietonne"),
+        };
+
+        for (Scenario sc : scenarios) {
+            Graph graph = testerScenario(sc);
+
+            ShortestPathData data = new ShortestPathData(
+                    graph,
+                    graph.get(sc.origine),
+                    graph.get(sc.destination),
+                    ArcInspectorFactory.getAllFilters().get(sc.filtre)
+            );
+
+            final Path pd = new DijkstraAlgorithm(data).run().getPath();
+            final Path pa = new AStarAlgorithm(data).run().getPath();
+            final Path cheminRef;
+            if (sc.cheminRef != null) {
+                try (final PathReader pathReader = new BinaryPathReader(
+                        new DataInputStream(new BufferedInputStream(
+                                new FileInputStream(sc.cheminRef))))) {
+                    cheminRef = pathReader.readPath(graph);
+                }
+            } else {
+                cheminRef = null;
+            }
+
+            // create the drawing
+            final Drawing drawing = createDrawing();
+
+            // draw the graph and paths on the drawing, same mechanism as createDrawing
+            SwingUtilities.invokeAndWait(new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        // draw the graph on the drawing
+                        drawing.drawGraph(graph);
+                        // draw the path on the drawing
+                        if (pd != null) drawing.drawPath(pd);
+                        if (pa != null) drawing.drawPath(pa);
+                        if (cheminRef != null) drawing.drawPath(cheminRef);
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    }
+                }
+            });
+        }
+    }
+}
\ No newline at end of file