diff --git a/src/ch/zhaw/ads/AVLSearchTree.java b/src/ch/zhaw/ads/AVLSearchTree.java
index ec63de5..6a6441f 100644
--- a/src/ch/zhaw/ads/AVLSearchTree.java
+++ b/src/ch/zhaw/ads/AVLSearchTree.java
@@ -18,7 +18,15 @@ public class AVLSearchTree<T extends Comparable<T>> extends SortedBinaryTree<T>
 
     @Override
     protected int calcSize(TreeNode<T> p) {
-        // TODO Implement (6.2)
+        // Implement (6.2)
+        int sizeLeft = 0, sizeRight = 0;
+        if(p.left != null){
+            sizeLeft = calcSize(p.left);
+        }
+        if(p.right != null) {
+            sizeRight = calcSize(p.right);
+        }
+        return sizeLeft + sizeRight + 1;
     }
 
     /**
@@ -41,15 +49,18 @@ public class AVLSearchTree<T extends Comparable<T>> extends SortedBinaryTree<T>
             return null;
         } else if (height(p.left) - height(p.right) == 2) {
             if (height(p.left.left) >= height(p.left.right)) {
-                // TODO Implement (6.2)
+                // Implement (6.2)
+                p = rotateR(p);
             } else {
-                // TODO Implement (6.2)
+                p = rotateLR(p);
             }
         } else if (height(p.right) - height(p.left) == 2) {
             if (height(p.right.right) >= height(p.right.left)) {
-                // TODO Implement (6.2)
+                // Implement (6.2)
+                p = rotateL(p);
             } else {
-                // TODO Implement (6.2)
+                // Implement (6.2)
+                p = rotateRL(p);
             }
         }
         p.height = Math.max(height(p.left), height(p.right)) + 1;