diff --git a/src/main/java/fabrik/simulator/pic16f84/Commands.java b/src/main/java/fabrik/simulator/pic16f84/Commands.java
index 5fef11c..bd2856a 100644
--- a/src/main/java/fabrik/simulator/pic16f84/Commands.java
+++ b/src/main/java/fabrik/simulator/pic16f84/Commands.java
@@ -1,7 +1,8 @@
 package fabrik.simulator.pic16f84;
+
 import fabrik.simulator.pic16f84.interfaces.*;
 
-public class Commands extends PICComponent implements CommandInterface {
+public class Commands extends ExecutionTimeSubject implements CommandInterface {
     private int wRegister;
     private long totalExecutionTime;
     private double executionTimeMultiplier = 1;
@@ -18,16 +19,17 @@ public class Commands extends PICComponent implements CommandInterface {
 
     public void addExecutionTime(int i) {
         totalExecutionTime +=  i;
-        timer.cycles(i);
-        eeprom.registerTime(false);
+        super.notifyObservers();
     }
 
+    @Override
     public double getTotalExecutionTime() {
         return (totalExecutionTime * getExecutionTimeMultiplier());
     }
 
     public void resetTotalExecutionTime() {
         totalExecutionTime = 0;
+        super.notifyObservers();
     }
 
 
@@ -556,10 +558,12 @@ public class Commands extends PICComponent implements CommandInterface {
         }
     }
 
+    @Override
     public double getExecutionTimeMultiplier(){
         return executionTimeMultiplier;
     }
 
+    @Override
     public void setExecutionTimeMultiplier(String option){
         switch (option) {
             case "8 MHZ":
@@ -584,11 +588,6 @@ public class Commands extends PICComponent implements CommandInterface {
                 executionTimeMultiplier = 125;
                 break;
         }
-    }
-
-
-    @Override
-    public void initialize(PICComponentLocator locator) {
-        super.initialize(locator);
+    super.notifyObservers();
     }
 }
diff --git a/src/main/java/fabrik/simulator/pic16f84/Controller_Frontend.java b/src/main/java/fabrik/simulator/pic16f84/Controller_Frontend.java
index f6cd6c4..238ba1d 100644
--- a/src/main/java/fabrik/simulator/pic16f84/Controller_Frontend.java
+++ b/src/main/java/fabrik/simulator/pic16f84/Controller_Frontend.java
@@ -38,7 +38,7 @@ import java.util.Set;
 
 import static java.lang.Math.max;
 
-public class Controller_Frontend extends PICComponent implements FrontendControllerInterface {
+public class Controller_Frontend extends PICComponent implements FrontendControllerInterface, ExecutionTimeObserver {
 
     private int [] prog;
     private int [][] read;
@@ -165,7 +165,7 @@ public class Controller_Frontend extends PICComponent implements FrontendControl
 
     private void updateExecutionTimeMultiplier() {
         String selectedOption = executionTimeComboBox.getValue();
-        commands.setExecutionTimeMultiplier(selectedOption);
+        executionTime.setExecutionTimeMultiplier(selectedOption);
     }
 
     @FXML
@@ -226,10 +226,9 @@ public class Controller_Frontend extends PICComponent implements FrontendControl
         ioPorts.refreshUI(getTRISbuttons(), getPORTbuttons());
         updateStack();
         updateWatchdog();
-        double totalExecutionTime = commands.getTotalExecutionTime();
-        totalExecutionTimeLabel.setText("Total Execution Time: " + totalExecutionTime + "µs");
     }
 
+
     private void markSelectedRow(int currentIndex, String selectedRowStyle) {
         lstContentListView.setCellFactory(column -> new ListCell<String>() {
             @Override
@@ -284,7 +283,7 @@ public class Controller_Frontend extends PICComponent implements FrontendControl
             ExecutionState.wakeUp();
             breakpoints.clear();
             ioPorts.refreshUI(getTRISbuttons(), getPORTbuttons());
-            commands.resetTotalExecutionTime();
+            executionTime.resetTotalExecutionTime();
             watchdogTimer.reset();
             wdtCheck.setSelected(false);
             table.refresh();
@@ -570,5 +569,10 @@ public class Controller_Frontend extends PICComponent implements FrontendControl
         this.picComponents = locator;
         System.out.println("Frontend");
     }
+
+    @Override
+    public void executionTimeChanged() {
+        totalExecutionTimeLabel.setText("Total Execution Time: " + executionTime.getTotalExecutionTime() + "µs");
+    }
 }
 
diff --git a/src/main/java/fabrik/simulator/pic16f84/EEPROM.java b/src/main/java/fabrik/simulator/pic16f84/EEPROM.java
index 747b76f..5a341e1 100644
--- a/src/main/java/fabrik/simulator/pic16f84/EEPROM.java
+++ b/src/main/java/fabrik/simulator/pic16f84/EEPROM.java
@@ -13,7 +13,7 @@ import java.nio.file.Paths;
 
 import fabrik.simulator.pic16f84.interfaces.*;
 
-public class EEPROM extends PICComponent implements EEPROMInterface {
+public class EEPROM extends PICComponent implements EEPROMInterface, ExecutionTimeObserver {
     private final int EEDATA = 0x08;
     private final int EEADR = 0x09;
     private final int EECON1 = 0x88;
@@ -83,13 +83,13 @@ public class EEPROM extends PICComponent implements EEPROMInterface {
             dataRegister.setDirectBit(EECON1, WRERR, 1);
             return;
         }
-        registerTime(true);
+        registerTime(executionTime.getTotalExecutionTime(), true);
     }
 
-    public void registerTime(boolean reset) {
+    public void registerTime(double executionTime, boolean reset) {
         if (reset)
-            startTime = commands.getTotalExecutionTime();
-        else if ((commands.getTotalExecutionTime() >= (startTime + 1000)) && writeControl) {
+            startTime = executionTime;
+        else if ((executionTime >= (startTime + 1000)) && writeControl) {
             eecon2stages = new boolean[]{false, false};
             dataRegister.setDirectBit(EECON1, EEIF, 1);
             dataRegister.setDirectBit(EECON1, WR, 0);
@@ -175,4 +175,9 @@ public class EEPROM extends PICComponent implements EEPROMInterface {
     public void initialize(PICComponentLocator locator) {
         super.initialize(locator);
     }
+
+    @Override
+    public void executionTimeChanged() {
+        registerTime(executionTime.getTotalExecutionTime(), false);
+    }
 }
diff --git a/src/main/java/fabrik/simulator/pic16f84/ExecutionTimeSubject.java b/src/main/java/fabrik/simulator/pic16f84/ExecutionTimeSubject.java
new file mode 100644
index 0000000..6b2dff2
--- /dev/null
+++ b/src/main/java/fabrik/simulator/pic16f84/ExecutionTimeSubject.java
@@ -0,0 +1,75 @@
+package fabrik.simulator.pic16f84;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import fabrik.simulator.pic16f84.interfaces.ExecutionTimeObserver;
+import fabrik.simulator.pic16f84.interfaces.PICComponentInterface;
+
+public abstract class ExecutionTimeSubject extends PICComponent implements PICComponentInterface{
+    private Set<ExecutionTimeObserver> observers;
+    
+    public ExecutionTimeSubject(){
+        super();
+        this.observers = new HashSet<>();
+    }
+
+
+    public void registerObserver(ExecutionTimeObserver observer){
+        observers.add(observer);
+    }
+
+    public void unregisterObserver(ExecutionTimeObserver observer){
+        observers.remove(observer);
+    }
+
+    protected void notifyObservers(){
+        for (final ExecutionTimeObserver each : observers){
+            notify(each);
+                    }
+                }
+             
+    protected void notify(final ExecutionTimeObserver observer) {
+        createNotifierFor(observer).start();
+    }
+            
+            
+    protected Thread createNotifierFor(ExecutionTimeObserver observer) {
+        return new Thread(){
+            public void run(){
+                try {
+                    observer.executionTimeChanged();
+                } catch (Exception e){
+                    e.printStackTrace();
+                    ExecutionTimeSubject.this.observers.remove(observer);
+                }
+            }
+        };
+    }
+        
+        
+    public double getTotalExecutionTime(){
+        throw new UnsupportedOperationException("No class implements ExecutionTimeSubject correctly!");
+    }
+    
+    public void addExecutionTime(int i){
+        throw new UnsupportedOperationException("No class implements ExecutionTimeSubject correctly!");
+    }
+
+    public double getExecutionTimeMultiplier(){
+        throw new UnsupportedOperationException("No class implements ExecutionTimeSubject correctly!");
+    }
+
+    public void setExecutionTimeMultiplier(String option){
+        throw new UnsupportedOperationException("No class implements ExecutionTimeSubject correctly!");
+    }
+    
+    public void resetTotalExecutionTime(){
+        throw new UnsupportedOperationException("No class implements ExecutionTimeSubject correctly!");
+    }
+
+    @Override
+    public void initialize(PICComponentLocator locator) {
+        super.initialize(locator);
+    }
+}
diff --git a/src/main/java/fabrik/simulator/pic16f84/Main.java b/src/main/java/fabrik/simulator/pic16f84/Main.java
index 3454c59..0092a97 100644
--- a/src/main/java/fabrik/simulator/pic16f84/Main.java
+++ b/src/main/java/fabrik/simulator/pic16f84/Main.java
@@ -6,7 +6,9 @@ public class Main {
     private static final PICComponentLocator picComponents = new PICComponentLocator(); // Subjekt
 
     public static void main(String[] args) {
-        picComponents.registerComponent(CommandInterface.class, new Commands());
+        Commands commands = new Commands();
+        picComponents.registerComponent(CommandInterface.class, commands);
+        picComponents.registerComponent(ExecutionTimeSubject.class, commands);
         picComponents.registerComponent(DataRegisterInterface.class, new DataRegister());
         picComponents.registerComponent(EEPROMInterface.class, new EEPROM());
         picComponents.registerComponent(InterruptInterface.class, new Interrupts());
diff --git a/src/main/java/fabrik/simulator/pic16f84/PICComponent.java b/src/main/java/fabrik/simulator/pic16f84/PICComponent.java
index 98e9a28..291a7ca 100644
--- a/src/main/java/fabrik/simulator/pic16f84/PICComponent.java
+++ b/src/main/java/fabrik/simulator/pic16f84/PICComponent.java
@@ -14,6 +14,7 @@ public abstract class PICComponent {
     WatchdogTimerInterface watchdogTimer;
     ProgramStackInterface programStack;
     CommandInterface commands;
+    ExecutionTimeSubject executionTime;
     ToggleButtonInterface toggleButtonExt;
 
     public void initialize(PICComponentLocator locator) {
@@ -29,5 +30,6 @@ public abstract class PICComponent {
         programStack = locator.getComponent(ProgramStackInterface.class);
         commands = locator.getComponent(CommandInterface.class);
         table = locator.getComponent(TableInterface.class);
+        executionTime = locator.getComponent(ExecutionTimeSubject.class);
     }
 }
diff --git a/src/main/java/fabrik/simulator/pic16f84/Timer.java b/src/main/java/fabrik/simulator/pic16f84/Timer.java
index 81ba34f..2061309 100644
--- a/src/main/java/fabrik/simulator/pic16f84/Timer.java
+++ b/src/main/java/fabrik/simulator/pic16f84/Timer.java
@@ -1,8 +1,9 @@
 package fabrik.simulator.pic16f84;
 
+import fabrik.simulator.pic16f84.interfaces.ExecutionTimeObserver;
 import fabrik.simulator.pic16f84.interfaces.TimerInterface;
 
-public class Timer extends PICComponent implements TimerInterface {
+public class Timer extends PICComponent implements TimerInterface, ExecutionTimeObserver {
     private final int TIMERREG = 0x1;
     private final int T0SE = 0x4;
     private final int T0CS = 0x5;
@@ -67,4 +68,9 @@ public class Timer extends PICComponent implements TimerInterface {
     public void initialize(PICComponentLocator locator) {
         super.initialize(locator);
     }
+
+    @Override
+    public void executionTimeChanged() {
+        cycles((int) executionTime.getTotalExecutionTime());
+    }
 }
diff --git a/src/main/java/fabrik/simulator/pic16f84/WatchdogTimer.java b/src/main/java/fabrik/simulator/pic16f84/WatchdogTimer.java
index a2c16b4..3ae2ad3 100644
--- a/src/main/java/fabrik/simulator/pic16f84/WatchdogTimer.java
+++ b/src/main/java/fabrik/simulator/pic16f84/WatchdogTimer.java
@@ -21,18 +21,18 @@ public class WatchdogTimer extends PICComponent implements WatchdogTimerInterfac
         if (enabled) {
             if (realtimer >= (watchdogTime + lastReset - 1)) {
                 dataRegister.clearBit(3, 4);
-                lastReset = commands.getTotalExecutionTime();
+                lastReset = executionTime.getTotalExecutionTime();
                 frontendController.stopRunFromBackend("Watchdog Timer");
             }
             else {
                 rawtimer++;
-                realtimer = (long) (rawtimer * commands.getExecutionTimeMultiplier());
+                realtimer = (long) (rawtimer * executionTime.getExecutionTimeMultiplier());
             }
         }
     }
 
     public void reset (){
-        lastReset = commands.getTotalExecutionTime();
+        lastReset = executionTime.getTotalExecutionTime();
         rawtimer = 0;
         realtimer = 0;
         preScaler.reset();
diff --git a/src/main/java/fabrik/simulator/pic16f84/interfaces/CommandInterface.java b/src/main/java/fabrik/simulator/pic16f84/interfaces/CommandInterface.java
index 4cbeacb..3381b73 100644
--- a/src/main/java/fabrik/simulator/pic16f84/interfaces/CommandInterface.java
+++ b/src/main/java/fabrik/simulator/pic16f84/interfaces/CommandInterface.java
@@ -3,17 +3,10 @@ package fabrik.simulator.pic16f84.interfaces;
 public interface CommandInterface extends PICComponentInterface {
     void CALL(int isr);
 
-    double getTotalExecutionTime();
-
     int get_wRegister();
 
     void decode(int i);
 
-    void resetTotalExecutionTime();
 
-    void addExecutionTime(int i);
 
-    double getExecutionTimeMultiplier();
-
-    void setExecutionTimeMultiplier(String option);
 }
diff --git a/src/main/java/fabrik/simulator/pic16f84/interfaces/EEPROMInterface.java b/src/main/java/fabrik/simulator/pic16f84/interfaces/EEPROMInterface.java
index 4f4c49f..1473f4d 100644
--- a/src/main/java/fabrik/simulator/pic16f84/interfaces/EEPROMInterface.java
+++ b/src/main/java/fabrik/simulator/pic16f84/interfaces/EEPROMInterface.java
@@ -1,7 +1,7 @@
 package fabrik.simulator.pic16f84.interfaces;
 
 public interface EEPROMInterface extends PICComponentInterface {
-    void registerTime(boolean b);
+    void registerTime(double executionTime, boolean b);
 
     void parse(int i, int content, int i1);
 
diff --git a/src/main/java/fabrik/simulator/pic16f84/interfaces/ExecutionTimeObserver.java b/src/main/java/fabrik/simulator/pic16f84/interfaces/ExecutionTimeObserver.java
new file mode 100644
index 0000000..fe46990
--- /dev/null
+++ b/src/main/java/fabrik/simulator/pic16f84/interfaces/ExecutionTimeObserver.java
@@ -0,0 +1,5 @@
+package fabrik.simulator.pic16f84.interfaces;
+
+public interface ExecutionTimeObserver {
+    void executionTimeChanged();
+}
diff --git a/src/test/java/fabrik/simulator/pic16f84/CommandsTests.java b/src/test/java/fabrik/simulator/pic16f84/CommandsTests.java
index 43d7721..a5a5552 100644
--- a/src/test/java/fabrik/simulator/pic16f84/CommandsTests.java
+++ b/src/test/java/fabrik/simulator/pic16f84/CommandsTests.java
@@ -27,7 +27,7 @@ class CommandsTests {
         EEPROMInterface eepromMock = mock(EEPROMInterface.class);
         picComponents.registerComponent(EEPROMInterface.class, eepromMock);
 
-        CommandInterface commands = new Commands();
+        Commands commands = new Commands();
         picComponents.registerComponent(CommandInterface.class, commands);
         picComponents.initAll();
 
@@ -47,7 +47,7 @@ class CommandsTests {
         EEPROMInterface eepromMock = mock(EEPROMInterface.class);
         picComponents.registerComponent(EEPROMInterface.class, eepromMock);
 
-        CommandInterface commands = new Commands();
+        Commands commands = new Commands();
         picComponents.registerComponent(CommandInterface.class, commands);
         picComponents.initAll();
 
@@ -68,7 +68,7 @@ class CommandsTests {
         EEPROMInterface eepromMock = mock(EEPROMInterface.class);
         picComponents.registerComponent(EEPROMInterface.class, eepromMock);
 
-        CommandInterface commands = new Commands();
+        Commands commands = new Commands();
         picComponents.registerComponent(CommandInterface.class, commands);
         picComponents.initAll();
 
diff --git a/src/test/java/fabrik/simulator/pic16f84/EEPROMTests.java b/src/test/java/fabrik/simulator/pic16f84/EEPROMTests.java
index d1174ab..ad8bd0b 100644
--- a/src/test/java/fabrik/simulator/pic16f84/EEPROMTests.java
+++ b/src/test/java/fabrik/simulator/pic16f84/EEPROMTests.java
@@ -69,8 +69,8 @@ class EEPROMTests {
         DataRegisterInterface mockDataRegister = Mockito.mock(DataRegisterInterface.class);
         picComponents.registerComponent(DataRegisterInterface.class, mockDataRegister);
 
-        CommandInterface mockCommands = mock(CommandInterface.class);
-        picComponents.registerComponent(CommandInterface.class, mockCommands);
+        ExecutionTimeSubject mockExecutionTime = mock(ExecutionTimeSubject.class);
+        picComponents.registerComponent(ExecutionTimeSubject.class, mockExecutionTime);
 
         EEPROMInterface eeprom = new EEPROM();
         picComponents.registerComponent(EEPROMInterface.class, eeprom);
diff --git a/src/test/java/fabrik/simulator/pic16f84/WatchDogTimerTests.java b/src/test/java/fabrik/simulator/pic16f84/WatchDogTimerTests.java
index 3b601c4..b91a4db 100644
--- a/src/test/java/fabrik/simulator/pic16f84/WatchDogTimerTests.java
+++ b/src/test/java/fabrik/simulator/pic16f84/WatchDogTimerTests.java
@@ -29,13 +29,13 @@ class WatchDogTimerTests {
         picComponents.registerComponent(PreScalerInterface.class, mockPreScaler);
 
 
-        CommandInterface mockCommands = mock(CommandInterface.class);
+        ExecutionTimeSubject mockExecutionTime = mock(ExecutionTimeSubject.class);
         when(
-                mockCommands.getExecutionTimeMultiplier()
+                mockExecutionTime.getExecutionTimeMultiplier()
         ).thenReturn(
                 1.0
         );
-        picComponents.registerComponent(CommandInterface.class, mockCommands);
+        picComponents.registerComponent(ExecutionTimeSubject.class, mockExecutionTime);
 
         WatchdogTimerInterface watchDogTimer = new WatchdogTimer();
         picComponents.registerComponent(WatchdogTimerInterface.class, watchDogTimer);