diff --git a/src/main/java/edu/kit/typicalc/model/TypeVariableFactory.java b/src/main/java/edu/kit/typicalc/model/TypeVariableFactory.java
index 3a9669e..da28271 100644
--- a/src/main/java/edu/kit/typicalc/model/TypeVariableFactory.java
+++ b/src/main/java/edu/kit/typicalc/model/TypeVariableFactory.java
@@ -7,11 +7,15 @@ import edu.kit.typicalc.model.type.TypeVariable;
  */
 public class TypeVariableFactory {
 
+    private static final int FIRST_VARIABLE_INDEX = 1;
+
+    private int nextVariableIndex;
+
     /**
      * Initializes a new type variable factory.
      */
     protected TypeVariableFactory() {
-        // TODO
+        nextVariableIndex = FIRST_VARIABLE_INDEX;
     }
 
     /**
@@ -20,7 +24,8 @@ public class TypeVariableFactory {
      * @return a new unique type variable
      */
     public TypeVariable nextTypeVariable() {
-        return null;
-        // TODO
+        TypeVariable nextTypeVariable = new TypeVariable(nextVariableIndex);
+        nextVariableIndex++;
+        return nextTypeVariable;
     }
 }
diff --git a/src/main/java/edu/kit/typicalc/model/type/TypeVariable.java b/src/main/java/edu/kit/typicalc/model/type/TypeVariable.java
index 3c394fe..9e92658 100644
--- a/src/main/java/edu/kit/typicalc/model/type/TypeVariable.java
+++ b/src/main/java/edu/kit/typicalc/model/type/TypeVariable.java
@@ -1,4 +1,7 @@
 package edu.kit.typicalc.model.type;
 
 public class TypeVariable {
+    public TypeVariable(int index) {
+
+    }
 }