diff --git a/src/main/java/de/dhbwstuttgart/bytecode/Codegen.java b/src/main/java/de/dhbwstuttgart/bytecode/Codegen.java
index dbd0fe45..9d196167 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/Codegen.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/Codegen.java
@@ -975,7 +975,7 @@ public class Codegen {
     }
 
     private void generateField(TargetField field) {
-        cw.visitField(field.access() | ACC_PUBLIC, field.name(), field.type().toSignature(), field.type().toGenericSignature(), null);
+        cw.visitField(field.access() | ACC_PUBLIC, field.name(), field.type().toSignature(), field.type().toDescriptor(), null);
     }
 
     private void generateConstructor(TargetConstructor constructor) {
@@ -1018,10 +1018,10 @@ public class Codegen {
     private static String generateSignature(TargetClass clazz) {
         String ret = "<";
         for (var generic : clazz.generics()) {
-            ret += generic.name() + ":" + generic.bound().toGenericSignature();
+            ret += generic.name() + ":" + generic.bound().toDescriptor();
         }
         ret += ">";
-        ret += clazz.superType().toGenericSignature();
+        ret += clazz.superType().toDescriptor();
 
         return ret;
     }
diff --git a/src/main/java/de/dhbwstuttgart/bytecode/funN/FunNGenerator.java b/src/main/java/de/dhbwstuttgart/bytecode/funN/FunNGenerator.java
index d23cc524..d3917478 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/funN/FunNGenerator.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/funN/FunNGenerator.java
@@ -3,8 +3,10 @@ package de.dhbwstuttgart.bytecode.funN;
 import de.dhbwstuttgart.parser.scope.JavaClassName;
 import de.dhbwstuttgart.syntaxtree.type.GenericRefType;
 import de.dhbwstuttgart.syntaxtree.type.RefType;
-import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
 import de.dhbwstuttgart.syntaxtree.type.TypePlaceholder;
+import de.dhbwstuttgart.target.tree.type.TargetGenericType;
+import de.dhbwstuttgart.target.tree.type.TargetRefType;
+import de.dhbwstuttgart.target.tree.type.TargetType;
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.MethodVisitor;
 import org.objectweb.asm.Type;
@@ -23,24 +25,23 @@ import static org.objectweb.asm.Opcodes.*;
  */
 public class FunNGenerator implements FunNUtilities{
 
-    private static FunNGenerator funNGenerator = new FunNGenerator();
+    private static final FunNGenerator funNGenerator = new FunNGenerator();
 
     public static FunNGenerator getInstance(){
         return funNGenerator;
     }
 
-    private final String argumentGenericBase = "T";
-    private final String returnGeneric = "R";
-    private final String methodName = "apply";
+    private static final String argumentGenericBase = "T";
+    private static final String returnGeneric = "R";
+    private static final String methodName = "apply";
     private final int bytecodeVersion = V1_8;
 
     private final String objectSuperType = Type.getInternalName(Object.class).replace('.','/');
-    private final RefType objectRefType = new RefType(new JavaClassName(objectSuperType), null);
-    private final String objectSignature = applySignature(objectRefType);
+    private final String objectSignature = applySignature(TargetType.Object);
 
-    private String applyDescriptor(RefTypeOrTPHOrWildcardOrGeneric a) { return a.acceptTV(new TypeToDescriptor(true)); }
-    private String applySignature(RefTypeOrTPHOrWildcardOrGeneric a) { return a.acceptTV(new TypeToSignature(true)); }
-    private String applyNameDescriptor(RefTypeOrTPHOrWildcardOrGeneric a){ return a instanceof TypePlaceholder ? "LTPH;" : String.format("L%s;", applyDescriptor(a)); }
+    private String applyDescriptor(TargetType a) { return a.toDescriptor(); }
+    private String applySignature(TargetType a) { return a.toSignature(); }
+    private String applyNameDescriptor(TargetType a){ return a instanceof TargetGenericType ? "LTPH;" : String.format("L%s;", applyDescriptor(a)); }
 
     @Override
     public byte[] generateSuperBytecode(int numberArguments) {
@@ -50,11 +51,11 @@ public class FunNGenerator implements FunNUtilities{
 
         for (int currentParameter = 1; currentParameter <= numberArguments; currentParameter++){
             superFunNClassSignature.append(String.format("%s%d:%s",argumentGenericBase, currentParameter, objectSignature));
-            superFunNMethodSignature.append(String.format("T%s;", applySignature( new GenericRefType(argumentGenericBase + currentParameter, null))));
+            superFunNMethodSignature.append(String.format("T%s;", applySignature(new TargetRefType(argumentGenericBase + currentParameter))));
             superFunNMethodDescriptor.append(objectSignature);
         }
         superFunNClassSignature.append(String.format("%s:%s>%s", returnGeneric, objectSignature, objectSignature));
-        superFunNMethodSignature.append(String.format(")T%s;", applySignature(new GenericRefType(returnGeneric, null))));
+        superFunNMethodSignature.append(String.format(")T%s;", applySignature(new TargetRefType(returnGeneric))));
         superFunNMethodDescriptor.append(String.format(")%s", objectSignature));
 
         ClassWriter classWriter = new ClassWriter(0);
@@ -72,26 +73,19 @@ public class FunNGenerator implements FunNUtilities{
     }
 
     @Override
-    public byte[] generateSpecializedBytecode(List<RefTypeOrTPHOrWildcardOrGeneric> argumentTypes, RefTypeOrTPHOrWildcardOrGeneric returnType) {
-        List<RefTypeOrTPHOrWildcardOrGeneric> parameters = Stream
+    public byte[] generateSpecializedBytecode(List<TargetType> argumentTypes, TargetType returnType) {
+        List<TargetType> parameters = Stream
                 .concat(argumentTypes.stream(), Stream.of(returnType))
                 .collect(Collectors.toList());
-        RefType superFunN = new RefType(new JavaClassName(getSuperClassName(argumentTypes.size())), parameters , null);
-        StringBuilder funNClassSignature = new StringBuilder(objectSignature + (superFunN.acceptTV(new TypeToSignature(false))));
+        StringBuilder funNClassSignature = new StringBuilder(objectSignature + applySignature(new TargetRefType(getSuperClassName(argumentTypes.size()), parameters)));
         boolean containsGeneric = false;
 
         String genericSignature = "<";
-        for (RefTypeOrTPHOrWildcardOrGeneric typeArgument : parameters) {
+        for (TargetType typeArgument : parameters) {
             //ToDo Etienne: Refactor
-            if (typeArgument instanceof GenericRefType){
-                GenericRefType generic = (GenericRefType) typeArgument;
-                if(genericSignature.contains(generic.getParsedName())) continue;
-                genericSignature += String.format("%s:%s", generic.getParsedName(), applyDescriptor(generic));
-                containsGeneric = true;
-            } else if(typeArgument instanceof TypePlaceholder){
-                TypePlaceholder placeholder = (TypePlaceholder) typeArgument;
-                if(genericSignature.contains(applySignature(placeholder).substring(1))) continue;
-                genericSignature += String.format("%s:%s", applySignature(placeholder).substring(1), objectSignature);
+            if (typeArgument instanceof TargetGenericType generic){
+                if(genericSignature.contains(generic.name())) continue;
+                genericSignature += String.format("%s:%s", generic.name(), applyDescriptor(generic));
                 containsGeneric = true;
             }
         }
@@ -105,7 +99,7 @@ public class FunNGenerator implements FunNUtilities{
     }
 
     @Override
-    public String getSpecializedClassName(List<RefTypeOrTPHOrWildcardOrGeneric> argumentTypes, RefTypeOrTPHOrWildcardOrGeneric returnType) {
+    public String getSpecializedClassName(List<TargetType> argumentTypes, TargetType returnType) {
         return String.format("Fun%d$$%s%s",
                         argumentTypes.size(),
                         argumentTypes
@@ -118,17 +112,17 @@ public class FunNGenerator implements FunNUtilities{
     }
 
     @Override
-    public String getSpecializedDescriptor(List<RefTypeOrTPHOrWildcardOrGeneric> argumentTypes, RefTypeOrTPHOrWildcardOrGeneric returnType) {
-        return applyDescriptor(new RefType(new JavaClassName(getSpecializedClassName(argumentTypes, returnType)), null));
+    public String getSpecializedDescriptor(List<TargetType> argumentTypes, TargetType returnType) {
+        return applyDescriptor(new TargetRefType(getSpecializedClassName(argumentTypes, returnType)));
     }
 
     @Override
-    public String getSpecializedSignature(List<RefTypeOrTPHOrWildcardOrGeneric> argumentTypes, RefTypeOrTPHOrWildcardOrGeneric returnType) {
-        return applySignature(new RefType(new JavaClassName(getSpecializedClassName(argumentTypes, returnType)), null));
+    public String getSpecializedSignature(List<TargetType> argumentTypes, TargetType returnType) {
+        return applySignature(new TargetRefType(getSpecializedClassName(argumentTypes, returnType)));
     }
 
     @Override
-    public List<RefTypeOrTPHOrWildcardOrGeneric> getArguments(List<RefTypeOrTPHOrWildcardOrGeneric> list) {
+    public List<TargetType> getArguments(List<TargetType> list) {
         return list
                 .stream()
                 .limit(Math.max(0, list.size() - 1))
@@ -136,7 +130,7 @@ public class FunNGenerator implements FunNUtilities{
     }
 
     @Override
-    public RefTypeOrTPHOrWildcardOrGeneric getReturnType(List<RefTypeOrTPHOrWildcardOrGeneric> list) {
+    public TargetType getReturnType(List<TargetType> list) {
         if(list.size() == 0)
             throw new IndexOutOfBoundsException();
         return list.get(list.size() - 1);
diff --git a/src/main/java/de/dhbwstuttgart/bytecode/funN/FunNUtilities.java b/src/main/java/de/dhbwstuttgart/bytecode/funN/FunNUtilities.java
index dceb0f18..b34b4e65 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/funN/FunNUtilities.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/funN/FunNUtilities.java
@@ -1,6 +1,6 @@
 package de.dhbwstuttgart.bytecode.funN;
 
-import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
+import de.dhbwstuttgart.target.tree.type.TargetType;
 
 import java.io.File;
 import java.io.FileOutputStream;
@@ -11,13 +11,13 @@ public interface FunNUtilities {
     byte[] generateSuperBytecode(int numberArguments);
     String getSuperClassName(int numberArguments);
 
-    byte[] generateSpecializedBytecode(List<RefTypeOrTPHOrWildcardOrGeneric> argumentTypes, RefTypeOrTPHOrWildcardOrGeneric returnType);
-    String getSpecializedClassName(List<RefTypeOrTPHOrWildcardOrGeneric> argumentTypes, RefTypeOrTPHOrWildcardOrGeneric returnType);
-    String getSpecializedDescriptor(List<RefTypeOrTPHOrWildcardOrGeneric> argumentTypes, RefTypeOrTPHOrWildcardOrGeneric returnType);
-    String getSpecializedSignature(List<RefTypeOrTPHOrWildcardOrGeneric> argumentTypes, RefTypeOrTPHOrWildcardOrGeneric returnType);
+    byte[] generateSpecializedBytecode(List<TargetType> argumentTypes, TargetType returnType);
+    String getSpecializedClassName(List<TargetType> argumentTypes, TargetType returnType);
+    String getSpecializedDescriptor(List<TargetType> argumentTypes, TargetType returnType);
+    String getSpecializedSignature(List<TargetType> argumentTypes, TargetType returnType);
 
-    List<RefTypeOrTPHOrWildcardOrGeneric> getArguments(List<RefTypeOrTPHOrWildcardOrGeneric> list);
-    RefTypeOrTPHOrWildcardOrGeneric getReturnType(List<RefTypeOrTPHOrWildcardOrGeneric> list);
+    List<TargetType> getArguments(List<TargetType> list);
+    TargetType getReturnType(List<TargetType> list);
 
     @Deprecated
     public static boolean writeClassFile(String className, byte[] bytecode, File directory) {
diff --git a/src/main/java/de/dhbwstuttgart/target/generate/ASTToTargetAST.java b/src/main/java/de/dhbwstuttgart/target/generate/ASTToTargetAST.java
index 4aaee428..7229cb50 100644
--- a/src/main/java/de/dhbwstuttgart/target/generate/ASTToTargetAST.java
+++ b/src/main/java/de/dhbwstuttgart/target/generate/ASTToTargetAST.java
@@ -676,7 +676,7 @@ public class ASTToTargetAST {
                 var params = refType.getParaList().stream().map(ASTToTargetAST.this::convert).toList();
                 if (name.matches("Fun\\d+\\$\\$")) { // TODO This seems like a bad idea
                     var gen = FunNGenerator.getInstance();
-                    var className = gen.getSpecializedClassName(gen.getArguments(refType.getParaList()), gen.getReturnType(refType.getParaList()));
+                    var className = gen.getSpecializedClassName(gen.getArguments(params), gen.getReturnType(params));
                     if (!usedFunNSuperTypes.contains(params.size())) {
                         usedFunNSuperTypes.add(params.size());
                         var code = gen.generateSuperBytecode(params.size() - 1);
@@ -685,7 +685,7 @@ public class ASTToTargetAST {
                     }
                     if (!usedFunN.contains(className)) {
                         usedFunN.add(className);
-                        var code = gen.generateSpecializedBytecode(gen.getArguments(refType.getParaList()), gen.getReturnType(refType.getParaList()));
+                        var code = gen.generateSpecializedBytecode(gen.getArguments(params), gen.getReturnType(params));
                         var clazz = classLoader.loadClass(code);
                         auxiliaries.put(clazz.getName(), code);
                     }
diff --git a/src/main/java/de/dhbwstuttgart/target/tree/TargetMethod.java b/src/main/java/de/dhbwstuttgart/target/tree/TargetMethod.java
index 2865603f..b3b45fd5 100644
--- a/src/main/java/de/dhbwstuttgart/target/tree/TargetMethod.java
+++ b/src/main/java/de/dhbwstuttgart/target/tree/TargetMethod.java
@@ -22,15 +22,15 @@ public record TargetMethod(int access, String name, Set<TargetGeneric> generics,
     public static String getSignature(Set<TargetGeneric> generics, List<MethodParameter> parameters, TargetType returnType) {
         String ret = "<";
         for (var generic : generics) {
-            ret += generic.name() + ":" + generic.bound().toGenericSignature();
+            ret += generic.name() + ":" + generic.bound().toDescriptor();
         }
         ret += ">(";
         for (var param : parameters) {
-            ret += param.type().toGenericSignature();
+            ret += param.type().toDescriptor();
         }
         ret += ")";
         if (returnType == null) ret += "V";
-        else ret += returnType.toGenericSignature();
+        else ret += returnType.toDescriptor();
         return ret;
     }
 
diff --git a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetExtendsWildcard.java b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetExtendsWildcard.java
index a242dec9..db7c1eee 100644
--- a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetExtendsWildcard.java
+++ b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetExtendsWildcard.java
@@ -7,8 +7,8 @@ public record TargetExtendsWildcard(TargetType innerType) implements TargetType
     }
 
     @Override
-    public String toGenericSignature() {
-        return "+" + innerType.toGenericSignature();
+    public String toDescriptor() {
+        return "+" + innerType.toDescriptor();
     }
 
     @Override
diff --git a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetFunNType.java b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetFunNType.java
index 0b252d68..596bf773 100644
--- a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetFunNType.java
+++ b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetFunNType.java
@@ -1,26 +1,16 @@
 package de.dhbwstuttgart.target.tree.type;
 
+import de.dhbwstuttgart.bytecode.funN.FunNGenerator;
+
 import java.util.List;
 import java.util.stream.Collectors;
 
 public record TargetFunNType(int N, List<TargetType> params) implements TargetSpecializedType {
 
-    private static String nameDescriptor(TargetType type) {
-        if (type instanceof TargetGenericType) return "LTPH;";
-        return type.toSignature();
-    }
-
     @Override
     public String getInternalName() {
-        // TODO This is duplicate code from FunNGenerator, I think we should change it to accept TargetTypes and refactor.
-        var returnType = params.get(params.size() - 1);
-        var argumentTypes = params.subList(0, params.size() - 1);
-        return java.lang.String.format("Fun%d$$%s%s",
-                argumentTypes.size(),
-                argumentTypes.stream().map(TargetFunNType::nameDescriptor).collect(Collectors.joining()),
-                nameDescriptor(returnType))
-        .replace('/', '$')
-        .replace(";", "$_$");
+        var gen = FunNGenerator.getInstance();
+        return gen.getSpecializedClassName(gen.getArguments(params), gen.getReturnType(params));
     }
 
     @Override
diff --git a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetGenericType.java b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetGenericType.java
index 15900fb4..f3f49823 100644
--- a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetGenericType.java
+++ b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetGenericType.java
@@ -7,7 +7,7 @@ public record TargetGenericType(String name) implements TargetType {
     }
 
     @Override
-    public String toGenericSignature() {
+    public String toDescriptor() {
         return "T" + getInternalName() + ";";
     }
 
diff --git a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetPrimitiveType.java b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetPrimitiveType.java
index 9d3bbf46..fe41a342 100644
--- a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetPrimitiveType.java
+++ b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetPrimitiveType.java
@@ -8,7 +8,7 @@ public record TargetPrimitiveType(String name) implements TargetType {
     }
 
     @Override
-    public String toGenericSignature() {
+    public String toDescriptor() {
         return toSignature();
     }
 
diff --git a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSpecializedType.java b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSpecializedType.java
index 2a74307c..45e84fde 100644
--- a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSpecializedType.java
+++ b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSpecializedType.java
@@ -6,12 +6,12 @@ public sealed interface TargetSpecializedType extends TargetType permits TargetF
     List<TargetType> params();
 
     @Override
-    default String toGenericSignature() {
+    default String toDescriptor() {
         String ret = "L" + getInternalName();
         if (params().size() > 0) {
             ret += "<";
             for (var param : params()) {
-                ret += param.toGenericSignature();
+                ret += param.toDescriptor();
             }
             ret += ">";
         }
diff --git a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSuperWildcard.java b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSuperWildcard.java
index 52cc6dea..594ee2df 100644
--- a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSuperWildcard.java
+++ b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSuperWildcard.java
@@ -7,8 +7,8 @@ public record TargetSuperWildcard(TargetType innerType) implements TargetType {
     }
 
     @Override
-    public String toGenericSignature() {
-        return "-" + innerType.toGenericSignature();
+    public String toDescriptor() {
+        return "-" + innerType.toDescriptor();
     }
 
     @Override
diff --git a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetType.java b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetType.java
index 36d71af1..50ea6293 100644
--- a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetType.java
+++ b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetType.java
@@ -53,7 +53,7 @@ public sealed interface TargetType
     }
 
     String toSignature();
-    String toGenericSignature();
+    String toDescriptor();
     String getInternalName();
     String name();
 }