diff --git a/OOP_A03_Project/src/backend/Simulator.java b/OOP_A03_Project/src/backend/Simulator.java
index 9011cb7..f2cacef 100644
--- a/OOP_A03_Project/src/backend/Simulator.java
+++ b/OOP_A03_Project/src/backend/Simulator.java
@@ -1,6 +1,7 @@
 package backend;
 
 import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.Random;
 
 import windowInterface.MyInterface;
@@ -11,7 +12,6 @@ public class Simulator extends Thread {
 	
 	private final int COL_NUM = 100;
 	private final int LINE_NUM = 100;
-	private final int LIFE_TYPE_NUM = 4;
 	
 	//Conway Radius : 1
 	private final int LIFE_AREA_RADIUS = 1;
@@ -98,71 +98,72 @@ public class Simulator extends Thread {
 	 * method called at each step of the simulation
 	 * makes all the actions to go from one step to the other
 	 */
+	
 	public void makeStep() {
-		// agent behaviors first
-		// only modify if sure of what you do
-		// to modify agent behavior, see liveTurn method
-		// in agent classes
-		for(Agent agent : agents) {
-			ArrayList<Agent> neighbors = 
-					this.getNeighboringAnimals(
-					agent.getX(), 
-					agent.getY(), 
-					ANIMAL_AREA_RADIUS);
-			if(!agent.liveTurn(
-					neighbors,
-					this)) {
-				agents.remove(agent);
-			}
-			evolveField();
-		}
+		 // agent behaviors first
+		Iterator<Agent> it = agents.iterator();
+	    while (it.hasNext()) {
+	    	Agent agent = it.next();
+	        ArrayList<Agent> neighbors = this.getNeighboringAnimals(agent.getX(), agent.getY(), ANIMAL_AREA_RADIUS);
+	        if (!agent.liveTurn(neighbors, this)) {
+	            it.remove();
+	        }
+	    }
+	    // Then evolution of the field
+	    evolveField();
+	    System.out.println("makeStep called");
+	}
+	
+	
+	
+	private void evolveField() {
+	    int[][] newGrid = new int[LINE_NUM][COL_NUM];
+	    System.out.println("evolveField called");
+	    for (int y = 0; y < LINE_NUM; y++) {
+	        for (int x = 0; x < COL_NUM; x++) {
+	            int neighbors = countAliveNeighbors(x, y);
+	            System.out.println("Cell (" + x + "," + y + ") has " + neighbors + " neighbors");
+	            if (grid[y][x] == 1) { // Cell is alive
+	                if (fieldSurviveValues.contains(neighbors)) {
+	                    newGrid[y][x] = 1;
+	                } else {
+	                    newGrid[y][x] = 0;
+	                }
+	            } else { // Cell is dead
+	                if (fieldBirthValues.contains(neighbors)) {
+	                    newGrid[y][x] = 1;
+	                } else {
+	                    newGrid[y][x] = 0;
+	                }
+	            }
+	        }
+	    }
+	    grid = newGrid;
+	    System.out.println("Grid updated");
 	}
-		
-		private void evolveField() {
-			int[][] newGrid = new int[LINE_NUM][COL_NUM];
-			for (int y = 0; y < LINE_NUM; y++) {
-				for (int x = 0; x < COL_NUM; x++) {
-					int neighbors = countAliveNeighbors(x, y);
-					if (grid[y][x] == 1) { // Cell is alive
-						if (fieldSurviveValues.contains(neighbors)) {
-							newGrid[y][x] = 1;
-						} else {
-							newGrid[y][x] = 0;
-						}
-					} else { // Cell is dead
-						if (fieldBirthValues.contains(neighbors)) {
-							newGrid[y][x] = 1;
-						} else {
-							newGrid[y][x] = 0;
-						}
-					}
-				}
-			}
-			grid = newGrid;
-		}
-		
-
-		private int countAliveNeighbors(int x, int y) {
-			int count = 0;
-			for (int i = -LIFE_AREA_RADIUS; i <= LIFE_AREA_RADIUS; i++) {
-				for (int j = -LIFE_AREA_RADIUS; j <= LIFE_AREA_RADIUS; j++) {
-					if (i == 0 && j == 0) continue;
-					int nx = x + j;
-					int ny = y + i;
-					if (loopingBorder) {
-						nx = (nx + COL_NUM) % COL_NUM;
-						ny = (ny + LINE_NUM) % LINE_NUM;
-					}
-					if (nx >= 0 && nx < COL_NUM && ny >= 0 && ny < LINE_NUM) {
-						if (grid[ny][nx] == 1) {
-							count++;
-						}
-					}
-				}
-			}
-			return count;
-		}
 
+	private int countAliveNeighbors(int x, int y) {
+	    int count = 0;
+	    for (int i = -LIFE_AREA_RADIUS; i <= LIFE_AREA_RADIUS; i++) {
+	        for (int j = -LIFE_AREA_RADIUS; j <= LIFE_AREA_RADIUS; j++) {
+	            if (i == 0 && j == 0) continue;
+	            int nx = x + j;
+	            int ny = y + i;
+	            if (loopingBorder) {
+	                nx = (nx + COL_NUM) % COL_NUM;
+	                ny = (ny + LINE_NUM) % LINE_NUM;
+	            }
+	            if (nx >= 0 && nx < COL_NUM && ny >= 0 && ny < LINE_NUM) {
+	                if (grid[ny][nx] == 1) {
+	                    count++;
+	                }
+	            }
+	        }
+	    }
+	    return count;
+	}
+	
+		
 		
 		//then evolution of the field
 		// TODO : apply game rule to all cells of the field
@@ -190,8 +191,16 @@ public class Simulator extends Thread {
 	 * leave this as is
 	 */
 	public void stopSimu() {
-		stopFlag=true;
-		worldLoaded = false;
+	    stopFlag = true;
+	    while (this.isAlive()) {
+	        try {
+	            Thread.sleep(loopDelay);
+	        } catch (InterruptedException e) {
+	            e.printStackTrace();
+	        }
+	    }
+	    worldLoaded = false;
+		
 	}
 	
 
@@ -363,8 +372,8 @@ public class Simulator extends Thread {
 	}
 	
 	public void toggleClickAction() {
-		clickActionFlag = !clickActionFlag;
-		if (!this.isAlive() && worldLoaded) {
+	    clickActionFlag = !clickActionFlag;
+	    if (!this.isAlive() && worldLoaded) {
 	        startSimu();
 	    }
 	}	
@@ -419,13 +428,22 @@ public class Simulator extends Thread {
 	
 	
 	public void loadAgents(ArrayList<String> stringArray) {
+		agents.clear();
 		for (String line : stringArray) {
 			String[] elements = line.split(";");
+			if (elements.length < 3) {
+	            continue; // Skip invalid lines
+	        }
 			int x = Integer.parseInt(elements[0]);
 			int y = Integer.parseInt(elements[1]);
 			String type = elements[2];
-			if (type.equals("Sheep")) {
-				agents.add(new Sheep(x, y));
+			switch (type) {
+            case "Sheep":
+                agents.add(new Sheep(x, y));
+                break;
+            // Add cases for other agent types if needed
+            default:
+                System.out.println("Unknown agent type: " + type);
 			}
 		}	
 	}
@@ -442,17 +460,36 @@ public class Simulator extends Thread {
 		return clickActionFlag ? "sheep" : "cell";
 	}
 	public void startSimu() {
-	    if (!this.isAlive()) {
-	        stopFlag = false;
-	        this.start();
-	    } else {
-	        togglePause();
+		  if (worldLoaded) {
+		        if (!this.isAlive()) {
+		            stopFlag = false;
+		            this.start();
+		        } else {
+		            togglePause();
+		        }
+		    }
 	    }
-	}
 	
 	public void initializeWorld() {
 	    grid = new int[LINE_NUM][COL_NUM];
 	    agents.clear();
 	    worldLoaded = true;
 	}
+	
+	
+	public void restartSimu() {
+	    stopFlag = true;
+	    pauseFlag = false;
+	    while (this.isAlive()) {
+	        try {
+	            Thread.sleep(loopDelay);
+	        } catch (InterruptedException e) {
+	            e.printStackTrace();
+	        }
+	    }
+	    stopFlag = false;
+	    this.start();
+	}
+
+	
 }
\ No newline at end of file