diff --git a/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java b/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
index 1f9a67d1..4a7e2750 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
@@ -74,6 +74,12 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 	
 	protected boolean parallel;
 	
+	Integer nOfUnify = 0;
+	
+	Integer noUndefPair = 0;
+	
+	Integer noBacktracking = 0;
+	
 	public TypeUnifyTask() { 
 		rules = new RuleSet();
 	}
@@ -137,7 +143,8 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 		/*
 		 * Step 1: Repeated application of reduce, adapt, erase, swap 
 		 */
-		writeLog("Unifikation: " + eq.toString());
+		nOfUnify++;
+        writeLog(nOfUnify.toString() + " Unifikation: " + eq.toString());
 		//eq = eq.stream().map(x -> {x.setVariance((byte)-1); return x;}).collect(Collectors.toCollection(HashSet::new));
 		
 		/*
@@ -212,8 +219,9 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 		// If pairs occured that did not match one of the cartesian product cases,
 		// those pairs are contradictory and the unification is impossible.
 		if(!undefinedPairs.isEmpty()) {
+			noUndefPair++;
 			for (UnifyPair up : undefinedPairs) {
-				writeLog("UndefinedPairs; " + up);
+				writeLog(noUndefPair.toString() + " UndefinedPairs; " + up);
 				writeLog("BasePair; " + up.getBasePair());
 			}
 			Set<Set<UnifyPair>> error = new HashSet<>();
@@ -400,13 +408,13 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 		if (xi.isPresent()) {
 			variance = xi.get();
 		}		                                                  
-		if (variance == 1 && nextSetasList.size() > 1) {
-			List<Set<UnifyPair>> al = new ArrayList<>(nextSetasList.size());
-			for (int ii = 0; ii <  nextSetasList.size();ii++) {
-				al.add(0,nextSetasList.get(ii));
-			}
-			nextSetasList = al;
-		}
+		//if (variance == 1 && nextSetasList.size() > 1) {
+		//	List<Set<UnifyPair>> al = new ArrayList<>(nextSetasList.size());
+		//	for (int ii = 0; ii <  nextSetasList.size();ii++) {
+		//		al.add(0,nextSetasList.get(ii));
+		//	}
+		//	nextSetasList = al;
+		//}
 		//Set<UnifyPair> a = nextSetasListIt.next();
 		/*if (nextSetasList.size()>1) {zu loeschen
 			if (nextSetasList.iterator().next().iterator().next().getLhsType().getName().equals("D")) 
@@ -552,6 +560,8 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 				writeLog("nextSetasList: " + nextSetasList.toString());
 				writeLog("Number erased Elements (undef): " + (len - nextSetasList.size()));
 				System.out.println("");
+				noBacktracking++;
+				writeLog("Number of Backtracking: " + noBacktracking);
 			}
 			//if (nextSetasList.size() == 0 && isUndefinedPairSetSet(result) && nextSet.size() > 1) { 
 			//	return result;
@@ -1010,6 +1020,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 		Set<Set<UnifyPair>> result = new HashSet<>();
 		
 		UnifyType aPrime = PlaceholderType.freshPlaceholder();
+		((PlaceholderType)aPrime).setVariance(((PlaceholderType)a).getVariance());
 		UnifyType extAPrime = new ExtendsType(aPrime);
 		UnifyType thetaPrime = extThetaPrime.getExtendedType();
 		Set<UnifyPair> resultPrime = new HashSet<>();
@@ -1035,6 +1046,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 		Set<Set<UnifyPair>> result = new HashSet<>();
 		
 		UnifyType aPrime = PlaceholderType.freshPlaceholder();
+		((PlaceholderType)aPrime).setVariance(((PlaceholderType)a).getVariance());
 		UnifyType supAPrime = new SuperType(aPrime);
 		UnifyType thetaPrime = subThetaPrime.getSuperedType();
 		Set<UnifyPair> resultPrime = new HashSet<>();
@@ -1074,6 +1086,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 			UnifyType[] freshTphs = new UnifyType[thetaS.getTypeParams().size()];
 			for(int i = 0; !allGen && i < freshTphs.length; i++) {
 				freshTphs[i] = PlaceholderType.freshPlaceholder();
+				((PlaceholderType)freshTphs[i]).setVariance(((PlaceholderType)a).getVariance());
 				resultPrime.add(new UnifyPair(thetaS.getTypeParams().get(i), freshTphs[i], PairOperator.SMALLERDOTWC, pair.getSubstitution(), pair));
 			}
 			
@@ -1104,6 +1117,8 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 		//writeLog(resultPrime.toString());
 		
 		UnifyType freshTph = PlaceholderType.freshPlaceholder();
+		
+		((PlaceholderType)freshTph).setVariance(a.getVariance());
 		resultPrime = new HashSet<>();
 		resultPrime.add(new UnifyPair(a, new ExtendsType(freshTph), PairOperator.EQUALSDOT, pair.getSubstitution(), pair));
 		resultPrime.add(new UnifyPair(theta, freshTph, PairOperator.SMALLERDOT, pair.getSubstitution(), pair));