diff --git a/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGenMethod.java b/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGenMethod.java
index abf7237a..b7e6e6ea 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGenMethod.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGenMethod.java
@@ -842,6 +842,7 @@ public class BytecodeGenMethod implements StatementVisitor {
 				} else if(!helper.isInCurrPkg(clazz)){
 					if(clazz.contains("$$")) {
 						mDesc = helper.generateBCForFunN();
+//						mDesc = helper.generateBCForFunN(methCallType,typesOfParams);
 					}else {
 						try {
 							cLoader2 = new URLClassLoader(new URL[] {new URL("file://"+path)});
@@ -902,7 +903,9 @@ public class BytecodeGenMethod implements StatementVisitor {
 			mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, clazz.replace(".", "/"), methodCall.name,
 					mDesc, isInterface);
 		}
-
+		
+		// TODO: if called method is apply (from FI) then generate BC-instruction "CHECKCAST"
+		
 		if(methodRefl != null && !methodRefl.getReturnType().isPrimitive()) {
 			if(methodRefl.getReturnType().equals(Object.class)) {
 				String checkCast = getResolvedType(methodCall.getType());
diff --git a/src/main/java/de/dhbwstuttgart/bytecode/signature/Signature.java b/src/main/java/de/dhbwstuttgart/bytecode/signature/Signature.java
index 62a55d12..fbbacdfa 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/signature/Signature.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/signature/Signature.java
@@ -84,6 +84,30 @@ public class Signature {
 		sw = new SignatureWriter();
 		createSignatureForFunN(numberOfParams);
 	}
+	
+	public Signature(int numberOfParams, String to, String[] paramTypes) {
+		sw = new SignatureWriter();
+		createSignatureForFunN(numberOfParams, to, paramTypes);
+	}
+	
+	private void createSignatureForFunN(int numberOfParams, String to, String[] paramTypes) {
+		for(int i = 0;i<numberOfParams;i++) {
+			int j = i+1;
+			sw.visitFormalTypeParameter("T"+ j);
+			// getBounds von Params
+			sw.visitClassBound().visitClassType(paramTypes[i]);
+			sw.visitClassBound().visitEnd();
+		}
+
+		sw.visitFormalTypeParameter("R");
+		// getBounds vom Return-Type
+		sw.visitClassBound().visitClassType(to);
+		sw.visitClassBound().visitEnd();
+		// TODO: prüfe ob Return-Type = void,
+		sw.visitSuperclass().visitClassType(Type.getInternalName(Object.class));;
+		sw.visitEnd();
+		
+	}
 
 	private void createSignatureForFunN(int numberOfParams) {
 		
diff --git a/src/main/java/de/dhbwstuttgart/bytecode/utilities/MethodCallHelper.java b/src/main/java/de/dhbwstuttgart/bytecode/utilities/MethodCallHelper.java
index afeaa6c1..e1f7ea6d 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/utilities/MethodCallHelper.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/utilities/MethodCallHelper.java
@@ -234,6 +234,37 @@ public class MethodCallHelper {
 		writeClassFile(classWriter.toByteArray(), name);
 		return methDesc;
 	}
+	
+	public String generateBCForFunN(String returnType, String[] paramTypes) {
+		ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
+
+		SignatureWriter methSig = new SignatureWriter();
+
+		int numberOfParams = 0;
+		SignatureVisitor paramVisitor = methSig.visitParameterType();
+		Iterator<Expression> itr1 = methCall.arglist.getArguments().iterator();
+		String methDesc = "(";
+		while(itr1.hasNext()) {
+			numberOfParams++;
+			// getBounds
+			paramVisitor.visitTypeVariable("T" + numberOfParams);
+			methDesc += "L" + paramTypes[numberOfParams-1] + ";";
+			itr1.next();
+		}
+		methDesc += ")L" + returnType + ";";
+		
+		methSig.visitReturnType().visitTypeVariable("R");
+		// ")"+lam.getReturn.getBounds
+		Signature sig = new Signature(numberOfParams,returnType,paramTypes);
+		String name = "Fun" + numberOfParams + "$$";
+		classWriter.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC+Opcodes.ACC_INTERFACE + Opcodes.ACC_ABSTRACT, name, sig.toString(),
+				Type.getInternalName(Object.class), null);
+		MethodVisitor mvApply = classWriter.visitMethod(Opcodes.ACC_PUBLIC + Opcodes.ACC_ABSTRACT, "apply", methDesc,
+				methSig.toString(), null);
+		mvApply.visitEnd();
+		writeClassFile(classWriter.toByteArray(), name);
+		return methDesc;
+	}
 
 	private void writeClassFile(byte[] bytecode, String name) {
 		FileOutputStream output;
diff --git a/src/test/resources/bytecode/javFiles/Faculty.jav b/src/test/resources/bytecode/javFiles/Faculty.jav
index 6d85bb05..6576b3da 100644
--- a/src/test/resources/bytecode/javFiles/Faculty.jav
+++ b/src/test/resources/bytecode/javFiles/Faculty.jav
@@ -1,6 +1,6 @@
 import java.lang.Integer;
-import java.lang.Long;
-import java.lang.Short;
+//import java.lang.Long;
+//import java.lang.Short;
 
 public class Faculty {
     public fact;
diff --git a/src/test/resources/bytecode/javFiles/Sorting.jav b/src/test/resources/bytecode/javFiles/Sorting.jav
index 486bfd71..345819d7 100644
--- a/src/test/resources/bytecode/javFiles/Sorting.jav
+++ b/src/test/resources/bytecode/javFiles/Sorting.jav
@@ -7,17 +7,17 @@ public class Sorting{
         a.addAll(b);
         return a;
     }
-/*
+
 sort(in){
 	var firstHalf = in;
 	var secondHalf = in; 
 	return merge(sort(firstHalf), sort(secondHalf));
 }
-*/
 
-	
+
+	/*
 	void sort(a){
 		a = merge(a,a);
 	}
-	
+	*/
 }
diff --git a/src/test/resources/javFiles/Sorting.jav b/src/test/resources/javFiles/Sorting.jav
index 04ef23e5..e5897914 100644
--- a/src/test/resources/javFiles/Sorting.jav
+++ b/src/test/resources/javFiles/Sorting.jav
@@ -4,5 +4,12 @@ import java.util.Collection;
 class Sorting{
     void merge(a, b){
         a.addAll(b);
+        return a;
+    }
+    
+    sort(in){
+    	var firstHalf = in;
+    	var secondHalf = in; 
+    	return merge(sort(firstHalf), sort(secondHalf));
     }
 }
\ No newline at end of file