diff --git a/app/src/main/java/ch/nuth/zhaw/exbox/AVLSearchTree.java b/app/src/main/java/ch/nuth/zhaw/exbox/AVLSearchTree.java
index e226342..768e99f 100644
--- a/app/src/main/java/ch/nuth/zhaw/exbox/AVLSearchTree.java
+++ b/app/src/main/java/ch/nuth/zhaw/exbox/AVLSearchTree.java
@@ -19,7 +19,7 @@ public class AVLSearchTree<T extends Comparable<T>> extends SortedBinaryTree<T>
     @Override
     protected int calcSize(TreeNode<T> p) {
         // TODO Implement (6.2)
-        throw new RuntimeException();
+        return super.calcSize(p);
     }
 
     /**
@@ -43,14 +43,18 @@ public class AVLSearchTree<T extends Comparable<T>> extends SortedBinaryTree<T>
         } else if (height(p.left) - height(p.right) == 2) {
             if (height(p.left.left) >= height(p.left.right)) {
                 // TODO Implement (6.2)
+                rotateR(p);
             } else {
                 // TODO Implement (6.2)
+                rotateLR(p);
             }
         } else if (height(p.right) - height(p.left) == 2) {
             if (height(p.right.right) >= height(p.right.left)) {
                 // TODO Implement (6.2)
+                rotateL(p);
             } else {
                 // TODO Implement (6.2)
+                rotateRL(p);
             }
         }
         p.height = Math.max(height(p.left), height(p.right)) + 1;