diff --git a/src/main/java/com/example/Actor.java b/src/main/java/com/example/Actor.java
index a846e7d..9ad12a2 100644
--- a/src/main/java/com/example/Actor.java
+++ b/src/main/java/com/example/Actor.java
@@ -1,12 +1,24 @@
 package com.example;
 
+import akka.actor.typed.ActorRef;
 import akka.actor.typed.Behavior;
 import akka.actor.typed.javadsl.AbstractBehavior;
 import akka.actor.typed.javadsl.ActorContext;
 import akka.actor.typed.javadsl.Behaviors;
 import akka.actor.typed.javadsl.Receive;
 
+import java.util.Objects;
+
 public class Actor extends AbstractBehavior<Actor.Message> {
+    //TODO: Wartezeit bei der Operation
+    //Zurückgegebener String von der linken Seite
+    String leftSide;
+
+    //Zurückgegebener String von der rechten Seite
+    String rightSide;
+
+    //Zeichen für die Operation (Add, Sub, Mul) welche benutzt wird
+    String operationString;
 
     String name;
     Expression expression;
@@ -14,6 +26,12 @@ public class Actor extends AbstractBehavior<Actor.Message> {
 
     public record StartMessage(Expression expression) implements Message{}
 
+    //Antwort von dem linken Kind
+    public record LeftResponse(String string) implements Message{}
+
+    //Antwort von dem rechten Kind
+    public record RightResponse(String string) implements Message{}
+
     private Actor(ActorContext<Message> context, String name){
         super(context);
         this.name = name;
@@ -27,15 +45,52 @@ public class Actor extends AbstractBehavior<Actor.Message> {
     public Receive<Actor.Message> createReceive(){
         return newReceiveBuilder()
                 .onMessage(StartMessage.class, this::onStartMessage)
+                .onMessage(LeftResponse.class, this::onLeftResponse)
+                .onMessage(RightResponse.class, this::onRightResponse)
                 .build();
     }
 
     private Behavior<Message> onStartMessage(StartMessage message){
         this.expression = message.expression;
-        //Wenn initial nur Val übergeben wird -> einfach ausgeben
-        if(expression instanceof Expression.Val){
-            System.out.println(((Expression.Val) expression).inner());
+        //Wenn initial nur Val übergeben wird → einfach ausgeben ansonsten UnterActors erstellen
+        if (Objects.requireNonNull(expression) instanceof Expression.Add add) {
+            this.operationString = "+";
+            ActorRef<SubActor.Message> LeftSubActor = getContext().spawnAnonymous(SubActor.create());
+            LeftSubActor.tell(new SubActor.PrintAndEvaluate(getContext().getSelf(),add.left(), true));
+            ActorRef<SubActor.Message> RightSubActor = getContext().spawnAnonymous(SubActor.create());
+            RightSubActor.tell(new SubActor.PrintAndEvaluate(getContext().getSelf(),add.right(), false));
+        }
+        else if (expression instanceof Expression.Sub sub) {
+            this.operationString = "-";
+            ActorRef<SubActor.Message> LeftSubActor = getContext().spawnAnonymous(SubActor.create());
+            LeftSubActor.tell(new SubActor.PrintAndEvaluate(getContext().getSelf(),sub.left(), true));
+            ActorRef<SubActor.Message> RightSubActor = getContext().spawnAnonymous(SubActor.create());
+            RightSubActor.tell(new SubActor.PrintAndEvaluate(getContext().getSelf(),sub.right(), false));
+        }
+        else if (expression instanceof Expression.Mul mul) {
+            this.operationString = "*";
+            ActorRef<SubActor.Message> LeftSubActor = getContext().spawnAnonymous(SubActor.create());
+            LeftSubActor.tell(new SubActor.PrintAndEvaluate(getContext().getSelf(),mul.left(), true));
+            ActorRef<SubActor.Message> RightSubActor = getContext().spawnAnonymous(SubActor.create());
+            RightSubActor.tell(new SubActor.PrintAndEvaluate(getContext().getSelf(),mul.right(), false));
+        } else if (expression instanceof Expression.Val val) {
+            System.out.println(val.inner());
+        }
+        return this;
+    }
 
+    private Behavior<Message> onLeftResponse(LeftResponse response){
+        this.leftSide = response.string;
+        if(this.rightSide != null){
+            System.out.println("(" + leftSide + operationString + rightSide + ")");
+        }
+        return this;
+    }
+
+    private Behavior<Message> onRightResponse(RightResponse response){
+        this.rightSide = response.string;
+        if(this.leftSide != null){
+            System.out.println("(" + leftSide + operationString + rightSide + ")");
         }
         return this;
     }
diff --git a/src/main/java/com/example/AkkaMainSystem.java b/src/main/java/com/example/AkkaMainSystem.java
index d27ef68..a575eec 100644
--- a/src/main/java/com/example/AkkaMainSystem.java
+++ b/src/main/java/com/example/AkkaMainSystem.java
@@ -26,16 +26,12 @@ public class AkkaMainSystem extends AbstractBehavior<AkkaMainSystem.Create> {
     }
 
     private Behavior<Create> onCreate(Create command) {
-        //#create-actors
-        ActorRef<ExampleActor.Message> a = this.getContext().spawn(ExampleActor.create("Alice"), "alice");
-        ActorRef<ExampleTimerActor.Message> b = this.getContext().spawn(ExampleTimerActor.create(), "timeractor");
-
         //#create-actors
         Expression expression = Expression.generateExpression(6, 9);
-        Expression testExp = Expression.generateExpression(1,9);
+        Expression testExp = Expression.generateExpression(4,9);
         ActorRef<Actor.Message> test = this.getContext().spawn(Actor.create("Seng"), "Sengmann");
         test.tell(new Actor.StartMessage(testExp));
-        System.out.println(testExp.toString()+ "   Wert:" +expression.eval());
+        System.out.println("SOLL:  "+testExp.toString()+ "   Wert:" +testExp.eval());
         return this;
     }
 }
diff --git a/src/main/java/com/example/SubActor.java b/src/main/java/com/example/SubActor.java
new file mode 100644
index 0000000..3103216
--- /dev/null
+++ b/src/main/java/com/example/SubActor.java
@@ -0,0 +1,180 @@
+package com.example;
+
+import akka.actor.typed.ActorRef;
+import akka.actor.typed.Behavior;
+import akka.actor.typed.javadsl.AbstractBehavior;
+import akka.actor.typed.javadsl.ActorContext;
+import akka.actor.typed.javadsl.Behaviors;
+import akka.actor.typed.javadsl.Receive;
+
+import java.util.Objects;
+
+public class SubActor extends AbstractBehavior<SubActor.Message> {
+    //TODO: Wartezeit bei den Operationen
+    Expression expression;
+
+    //Zeichen für die Operation (Add, Sub, Mul) welche benutzt wird
+    String operationString;
+
+    //Referenz auf den initialen Actor
+    ActorRef<Actor.Message> initial;
+
+    //Referenz auf den (potenziellen) OberSubActor. Es ist immer entweder initial oder oberActor null.
+    ActorRef<SubActor.Message> oberActor;
+
+    //Linke Seite: true, Rechte Seite: false um zu wissen welche Seite des Ausdrucks berechnet wird.
+    boolean side;
+
+    //Zurückgegebener String von der linken Seite
+    String leftSide;
+
+    //Zurückgegebener String von der rechten Seite
+    String rightSide;
+
+    public interface Message {}
+
+    //Message kommt von dem initialen Actor
+    public record PrintAndEvaluate(ActorRef<Actor.Message> sender,Expression expression, Boolean side) implements Message{ }
+
+    //Message kommt von einem anderen SubActor
+    public record SubPrintAndEvaluate(ActorRef<SubActor.Message> sender,Expression expression, Boolean side) implements Message{ }
+
+    //Antwort von dem linken Kind (TODO: Später Integer hinzufügen wenn mit den Strings alles funktioniert)
+    public record LeftResponse(String string) implements Message{ }
+
+    //Antwort von dem rechten Kind (TODO: Später Integer hinzufügen wenn mit den Strings alles funktioniert)
+    public record RightResponse(String string) implements Message{ }
+
+    private SubActor(ActorContext<SubActor.Message> context){
+        super(context);
+    }
+
+    public static Behavior<SubActor.Message> create(){
+        return Behaviors.setup(context -> new SubActor(context));
+    }
+
+    @Override
+    public Receive<SubActor.Message> createReceive(){
+        return newReceiveBuilder()
+                .onMessage(PrintAndEvaluate.class, this::onPrintAndEvaluate)
+                .onMessage(SubPrintAndEvaluate.class, this::onSubPrintAndEvaluate)
+                .onMessage(LeftResponse.class, this::onLeftResponse)
+                .onMessage(RightResponse.class, this::onRightResponse)
+                .build();
+    }
+
+    //Die Nachricht von dem initialen Actor wird verarbeitet.
+    //Dabei wird seine Referenz in @initial gespeichert
+    public Behavior<Message> onPrintAndEvaluate(PrintAndEvaluate message) {
+        this.initial = message.sender;
+        this.expression = message.expression;
+        this.side = message.side;
+        //Wenn initial nur Val übergeben wird → einfach ausgeben ansonsten UnterActors erstellen
+        if (Objects.requireNonNull(expression) instanceof Expression.Add add) {
+            this.operationString = "+";
+            ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+            subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(), add.left(), true));
+            ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+            subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(), add.right(), false));
+        } else if (expression instanceof Expression.Sub sub) {
+            this.operationString = "-";
+            ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+            subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(),sub.left(), true));
+            ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+            subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(),sub.right(), false));
+        } else if (expression instanceof Expression.Mul mul) {
+            this.operationString = "*";
+            ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+            subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(),mul.left(), true));
+            ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+            subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(),mul.right(), false));
+        } else if (expression instanceof Expression.Val val) {
+            if(side == true){
+                initial.tell(new Actor.LeftResponse(String.valueOf(val.inner())));
+            }else{
+                initial.tell(new Actor.RightResponse(String.valueOf(val.inner())));
+            }
+        }
+        return this;
+    }
+
+        //Nachricht von einem SubActor wird verarbeitet.
+        //Dabei wird seine Referenz in oberActor gespeichert.
+        public Behavior<Message> onSubPrintAndEvaluate(SubPrintAndEvaluate message){
+            this.oberActor = message.sender;
+            this.expression = message.expression;
+            this.side = message.side;
+            //Wenn initial nur Val übergeben wird → einfach ausgeben ansonsten UnterActors erstellen
+            if (Objects.requireNonNull(expression) instanceof Expression.Add add) {
+                this.operationString = "+";
+                ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+                subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(),add.left(), true));
+                ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+                subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(),add.right(), false));
+            }
+            else if (expression instanceof Expression.Sub sub) {
+                this.operationString = "-";
+                ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+                subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(),sub.left(), true));
+                ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+                subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(),sub.right(), false));
+            }
+            else if (expression instanceof Expression.Mul mul) {
+                this.operationString = "*";
+                ActorRef<Message> subActorLeft = getContext().spawnAnonymous(SubActor.create());
+                subActorLeft.tell(new SubPrintAndEvaluate(getContext().getSelf(),mul.left(), true));
+                ActorRef<Message> subActorRight = getContext().spawnAnonymous(SubActor.create());
+                subActorRight.tell(new SubPrintAndEvaluate(getContext().getSelf(),mul.right(), false));
+            } else if (expression instanceof Expression.Val val) {
+                if(side == true){
+                    oberActor.tell(new SubActor.LeftResponse(String.valueOf(val.inner())));
+                }else{
+                    oberActor.tell(new SubActor.RightResponse(String.valueOf(val.inner())));
+                }
+            }
+            return this;
+    }
+
+    public Behavior<Message> onLeftResponse(LeftResponse response){
+        this.leftSide = response.string;
+        if(this.rightSide != null){
+            if(oberActor != null){
+                //side == true bedeutet, dass dieser Actor das linke Kind ist und es wird LeftResponse geschickt
+                if(side == true){
+                    oberActor.tell(new SubActor.LeftResponse("(" + leftSide + operationString + rightSide + ")"));
+                }else {
+                    oberActor.tell(new SubActor.RightResponse("(" + leftSide + operationString + rightSide + ")"));
+                }
+            }else{
+                if(side == true){
+                    initial.tell(new Actor.LeftResponse("(" + leftSide + operationString + rightSide + ")"));
+                }else {
+                    initial.tell(new Actor.RightResponse("(" + leftSide + operationString + rightSide + ")"));
+                }
+            }
+        }
+        return this;
+    }
+
+    public Behavior<Message> onRightResponse(RightResponse response){
+        this.rightSide = response.string;
+        if(this.leftSide != null){
+            if(oberActor != null){
+                //side == true bedeutet, dass dieser Actor das linke Kind ist und es wird LeftResponse geschickt
+                if(side == true){
+                    oberActor.tell(new SubActor.LeftResponse("(" + leftSide + operationString + rightSide + ")"));
+                }else {
+                    oberActor.tell(new SubActor.RightResponse("(" + leftSide + operationString + rightSide + ")"));
+                }
+            }else {
+                if(side == true){
+                    initial.tell(new Actor.LeftResponse("(" + leftSide + operationString + rightSide + ")"));
+                }else {
+                    initial.tell(new Actor.RightResponse("(" + leftSide + operationString + rightSide + ")"));
+                }
+            }
+        }
+        return this;
+    }
+
+}