diff --git a/src/main/java/designPatternExtensions/DependencyInversion.java b/src/main/java/designPatternExtensions/DependencyInversion.java
new file mode 100644
index 0000000..767d7dd
--- /dev/null
+++ b/src/main/java/designPatternExtensions/DependencyInversion.java
@@ -0,0 +1,15 @@
+package designPatternExtensions;
+
+import models.objectOrientedTransfer.ObjectNode;
+
+public class DependencyInversion {
+    private ObjectNode src;
+    private ObjectNode dst;
+    private InterfaceNode interfaceNode;
+
+    public DependencyInversion(ObjectNode src, ObjectNode dst, InterfaceNode interfaceNode) {
+        this.src = src;
+        this.dst = dst;
+        this.interfaceNode = interfaceNode;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/designPatternExtensions/InterfaceNode.java b/src/main/java/designPatternExtensions/InterfaceNode.java
new file mode 100644
index 0000000..7fbd6de
--- /dev/null
+++ b/src/main/java/designPatternExtensions/InterfaceNode.java
@@ -0,0 +1,21 @@
+package designPatternExtensions;
+
+import models.objectOrientedTransfer.ObjectNode;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class InterfaceNode extends ObjectNode {
+    private Set<ObjectNode> dependencySideNodes = new HashSet<>();
+    private ObjectNode implementSideNode = null;
+
+    public InterfaceNode(ObjectNode dependencySideNode, ObjectNode implementSideNode, String name) {
+        super(name);
+        this.dependencySideNodes.add(dependencySideNode);
+        this.implementSideNode = implementSideNode;
+    }
+
+    public Set<ObjectNode> getDependencySideNodes() { return dependencySideNodes; }
+    public void addDependencySideNode(ObjectNode node) { dependencySideNodes.add(node); }
+    public ObjectNode getImplementSideNode() { return implementSideNode; }
+}
diff --git a/src/main/java/designPatternExtensions/MediatorInsertion.java b/src/main/java/designPatternExtensions/MediatorInsertion.java
new file mode 100644
index 0000000..e694356
--- /dev/null
+++ b/src/main/java/designPatternExtensions/MediatorInsertion.java
@@ -0,0 +1,9 @@
+package designPatternExtensions;
+
+import models.objectOrientedTransfer.ObjectNode;
+
+public class MediatorInsertion {
+    private ObjectNode src;
+    private ObjectNode dst;
+    private ObjectNode mediator;
+}
\ No newline at end of file