diff --git a/src/backend/Simulator.java b/src/backend/Simulator.java
index e954a49..235f40f 100644
--- a/src/backend/Simulator.java
+++ b/src/backend/Simulator.java
@@ -1,7 +1,7 @@
 package backend;
 import java.util.ArrayList;
 import java.util.List;
-//Hey there 
+
 import windowInterface.MyInterface;
 
 public class Simulator extends Thread {
@@ -23,37 +23,46 @@ public class Simulator extends Thread {
 	private boolean stopFlag;
 	private boolean pauseFlag;
 	private boolean loopingBorder;
-	private String clickActionFlag;
+	private boolean clickActionFlag;
 	private int loopDelay = 150;
-	
-	private Grid grid;
 
 	//TODO : add missing attribute(s)
+	
+	private final boolean CELL_MOD = true;
+	private final boolean MAIN_MOD = false;
+	
+	
+	private Grid grid;
 
 	public Simulator(MyInterface mjfParam) {
 		mjf = mjfParam;
 		stopFlag=false;
 		pauseFlag=false;
 		loopingBorder=false;
-		clickActionFlag="CellMode";
+		clickActionFlag=CELL_MOD;
 
 		agents = new ArrayList<Agent>();
-		fieldSurviveValues = new ArrayList<>();
+		fieldBirthValues = new ArrayList<Integer>();
+		fieldSurviveValues = new ArrayList<Integer>();
+		fieldSurviveValues.clear();
+		fieldBirthValues.clear();
+		fieldBirthValues.add(3);
 		fieldSurviveValues.add(2);
 		fieldSurviveValues.add(3);
-
-		fieldBirthValues = new ArrayList<>();
-		fieldBirthValues.add(3);
-
-		grid = new Grid(LINE_NUM, COL_NUM);
+		//There's an issue with fieldSurviveValues : at a moment, when 1 neighbor, it counts the cell as a survivor
 		
+		grid = new Grid(LINE_NUM, COL_NUM);
+
+		//TODO : add missing attribute initialization
 	}
 
 	public int getWidth() {
+		//TODO : replace with proper return
 		return LINE_NUM;
 	}
 
 	public int getHeight() {
+		//TODO : replace with proper return
 		return COL_NUM;
 	}
 
@@ -119,13 +128,13 @@ public class Simulator extends Thread {
 		 */
 		
 		Grid nextGrid = new Grid(LINE_NUM, COL_NUM);
-
+		
 	    // Iterate over each cell in the grid
 	    for (int i = 0; i < LINE_NUM; i++) {
 	        for (int j = 0; j < COL_NUM; j++) {
 	            int liveNeighbors = countLiveNeighbors(i, j);
 
-	            if (getCell(i, j) == 1) {
+	            if (grid.getValueCell(i, j) == 1) {
 	                if (fieldSurviveValues.contains(liveNeighbors)) {
 	                    nextGrid.setValueCell(i, j, 1);
 	                } else {
@@ -142,7 +151,7 @@ public class Simulator extends Thread {
 	    }
 
 	    grid = nextGrid;
-	    
+		
 	}
 	
 	/*
@@ -166,9 +175,11 @@ public class Simulator extends Thread {
 	                if (neighborY < 0) neighborY = COL_NUM - 1;
 	                else if (neighborY >= COL_NUM) neighborY = 0;
 	            }
+	            
+	            
 
 	            if (neighborX >= 0 && neighborX < LINE_NUM && neighborY >= 0 && neighborY < COL_NUM) {
-	                if (getCell(neighborX, neighborY) == 1) {
+	                if (grid.getValueCell(neighborX, neighborY) == 1) {
 	                    liveNeighbors++;
 	                }
 	            }
@@ -177,8 +188,6 @@ public class Simulator extends Thread {
 
 	    return liveNeighbors;
 	}
-
-
 	
 	/*
 	 * leave this as is
@@ -191,12 +200,8 @@ public class Simulator extends Thread {
 	 * method called when clicking pause button
 	 */
 	public void togglePause() {
-		if (pauseFlag == true ) {
-			pauseFlag=false;
-		}
-		else {
-			pauseFlag=true;
-		}
+		// TODO : actually toggle the corresponding flag
+		pauseFlag=!pauseFlag;
 	}
 	
 	/**
@@ -204,7 +209,7 @@ public class Simulator extends Thread {
 	 */
 	public void clickCell(int x, int y) {
 		//TODO : complete method
-		if (clickActionFlag=="CellMode") {
+		if (clickActionFlag==CELL_MOD) {
 			if (grid.getValueCell(x, y)==1) {
 				this.setCell(x, y, 0);
 			}
@@ -221,6 +226,7 @@ public class Simulator extends Thread {
 	 * @return value of cell
 	 */
 	public int getCell(int x, int y) {
+		//TODO : complete method with proper return
 		return grid.getValueCell(x, y);
 	}
 	/**
@@ -255,6 +261,7 @@ public class Simulator extends Thread {
 	 * @param val to set in cell
 	 */
 	public void setCell(int x, int y, int val) {
+		//TODO : complete method
 		grid.setValueCell(x, y, val);
 	}
 	
@@ -264,6 +271,7 @@ public class Simulator extends Thread {
 	 * the simulated world in its present state
 	 */
 	public ArrayList<String> getSaveState() {
+		//TODO : complete method with proper return
 		ArrayList<String> saveState = new ArrayList<>();
 		
 	    for (int i = 0; i < LINE_NUM; i++) {
@@ -319,7 +327,15 @@ public class Simulator extends Thread {
 	 * to be alive in new state
 	 */
 	public void generateRandom(float chanceOfLife) {
-	    for (int i = 0; i < LINE_NUM; i++) {
+		//TODO : complete method
+		/*
+		 * Advice :
+		 * as you should probably have a separate class
+		 * representing the field of cells...
+		 * maybe just make a constructor in there 
+		 * and use it here
+		 */
+		for (int i = 0; i < LINE_NUM; i++) {
 	        for (int j = 0; j < COL_NUM; j++) {
 	            float randomValue = (float) Math.random();
 	            if (randomValue <= chanceOfLife) {
@@ -332,25 +348,24 @@ public class Simulator extends Thread {
 	}
 	
 	public boolean isLoopingBorder() {
+		//TODO : complete method with proper return
 		return loopingBorder;
 	}
 	
 	public void toggleLoopingBorder() {
-		if (isLoopingBorder() == true) {
-			loopingBorder=false;
-		}else {
-			loopingBorder=true;
-		}
+		//TODO : complete method
+		loopingBorder =!loopingBorder;
 		
 	}
 	
 	public void setLoopDelay(int delay) {
+		//TODO : complete method
 		loopDelay=delay;
 	}
 	
 	public void toggleClickAction() {
 		//TODO : complete method
-		if (clickActionFlag=="CellMode") {
+		if (clickActionFlag==CELL_MOD) {
 			
 		}
 	}
@@ -378,7 +393,7 @@ public class Simulator extends Thread {
 			System.out.println("empty rule file");
 			return;
 		}
-
+		//TODO : remove previous rule (=emptying lists)
 		fieldSurviveValues.clear();
 		fieldBirthValues.clear();
 		
@@ -388,6 +403,7 @@ public class Simulator extends Thread {
 		for(int x=0; x<surviveElements.length;x++) {
 			String elem = surviveElements[x];
 			int value = Integer.parseInt(elem);
+			//TODO : add value to possible survive values
 			fieldSurviveValues.add(value);
 			
 		}
@@ -395,6 +411,7 @@ public class Simulator extends Thread {
 		for(int x=0; x<birthElements.length;x++) {
 			String elem = birthElements[x];
 			int value = Integer.parseInt(elem);
+			//TODO : add value to possible birth values
 			fieldBirthValues.add(value);
 			
 		}
@@ -419,7 +436,7 @@ public class Simulator extends Thread {
 		// depending on clickActionFlag
 		String action = "Cell";
 		
-		if (clickActionFlag == "CellMode") {
+		if (clickActionFlag == CELL_MOD) {
 				action = "Cell";
 		}