diff --git a/src/de/dhbwstuttgart/typeinference/unify/model/ExtendsType.java b/src/de/dhbwstuttgart/typeinference/unify/model/ExtendsType.java
index 847abfd5..9416d786 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/model/ExtendsType.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/model/ExtendsType.java
@@ -14,7 +14,7 @@ public final class ExtendsType extends WildcardType {
 	 * @param extendedType The extended type e.g. Integer in "? extends Integer"
 	 */
 	public ExtendsType(UnifyType extendedType) {
-		super("? extends " + extendedType.getName(), extendedType, extendedType.getTypeParams());
+		super("? extends " + extendedType.getName(), extendedType);
 	}
 
 	public UnifyType getExtendedType() {
diff --git a/src/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java b/src/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java
index 879fe87d..ddb7d273 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/model/PlaceholderType.java
@@ -16,13 +16,13 @@ public final class PlaceholderType extends UnifyType{
 	private final boolean IsGenerated;
 	
 	public PlaceholderType(String name) {
-		super(name);
+		super(name, new TypeParams());
 		EXISTING_PLACEHOLDERS.add(name);
 		IsGenerated = false;
 	}
 	
 	protected PlaceholderType(String name, boolean isGenerated) {
-		super(name);
+		super(name, new TypeParams());
 		EXISTING_PLACEHOLDERS.add(name);
 		IsGenerated = isGenerated;
 	}
diff --git a/src/de/dhbwstuttgart/typeinference/unify/model/SuperType.java b/src/de/dhbwstuttgart/typeinference/unify/model/SuperType.java
index 363dbbf6..7c557ade 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/model/SuperType.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/model/SuperType.java
@@ -6,7 +6,7 @@ import de.dhbwstuttgart.typeinference.unify.interfaces.IFiniteClosure;
 
 public final class SuperType extends WildcardType {
 	public SuperType(UnifyType superedType) {
-		super("? super " + superedType.getName(), superedType, superedType.getTypeParams());
+		super("? super " + superedType.getName(), superedType);
 	}
 	
 	public UnifyType getSuperedType() {
diff --git a/src/de/dhbwstuttgart/typeinference/unify/model/Unifier.java b/src/de/dhbwstuttgart/typeinference/unify/model/Unifier.java
index cccaf591..f5af52d0 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/model/Unifier.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/model/Unifier.java
@@ -17,7 +17,7 @@ public class Unifier implements Function<UnifyType, UnifyType> /*, Set<MPair>*/
 	/**
 	 * Identity function as an "unifier".
 	 */
-	public Unifier() {
+	protected Unifier() {
 
 	}
 	
diff --git a/src/de/dhbwstuttgart/typeinference/unify/model/UnifyType.java b/src/de/dhbwstuttgart/typeinference/unify/model/UnifyType.java
index 341eabd1..4f1965eb 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/model/UnifyType.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/model/UnifyType.java
@@ -4,35 +4,76 @@ import java.util.Set;
 
 import de.dhbwstuttgart.typeinference.unify.interfaces.IFiniteClosure;
 
+/**
+ * Represents a java type.
+ * @author Florian Steurer
+ */
 public abstract class UnifyType {
 	
+	/**
+	 * The name of the type e.q. "Integer", "? extends Integer" or "List" for (List<T>)
+	 */
 	protected final String typeName;
+	
+	/**
+	 * The type parameters of the type.
+	 */
 	protected final TypeParams typeParams;
 	
-	protected UnifyType(String name, UnifyType... typeParams) {
-		typeName = name;
-		this.typeParams = new TypeParams(typeParams);
-	}
-	
+	/**
+	 * Creates a new instance
+	 * @param name Name of the type (e.q. List for List<T>, Integer or ? extends Integer)
+	 * @param typeParams Parameters of the type (e.q. <T> for List<T>)
+	 */
 	protected UnifyType(String name, TypeParams p) {
 		typeName = name;
 		typeParams = p;
 	}
 	
+	/**
+	 * Returns the name of the type.
+	 * @return The name e.q. List for List<T>, Integer or ? extends Integer
+	 */
 	public String getName() {
 		return typeName;
 	}
 	
+	/**
+	 * The parameters of the type.
+	 * @return Parameters of the type, e.q. <T> for List<T>.
+	 */
 	public TypeParams getTypeParams() {
 		return typeParams;
 	}
 	
+	/**
+	 * Returns a new type that equals this type except for the type parameters.
+	 * @param newTp The type params of the new type.
+	 * @return A new type object.
+	 */
 	public abstract UnifyType setTypeParams(TypeParams newTp);
 	
+	/**
+	 * Implementation of the visitor-pattern. Returns the set of smArg
+	 * by calling the most specific overload in the FC.
+	 * @param fc The FC that is called.
+	 * @return The set that is smArg(this)
+	 */
 	abstract Set<UnifyType> smArg(IFiniteClosure fc);
 	
+	/**
+	 * Implementation of the visitor-pattern. Returns the set of grArg
+	 * by calling the most specific overload in the FC.
+	 * @param fc The FC that is called.
+	 * @return The set that is grArg(this)
+	 */
 	abstract Set<UnifyType> grArg(IFiniteClosure fc);
 	
+	/**
+	 * Applies a unifier to this object.
+	 * @param unif The unifier
+	 * @return A UnifyType, that may or may not be a new object, that has its subtypes substituted.
+	 */
 	abstract UnifyType apply(Unifier unif);
 	
 	@Override
diff --git a/src/de/dhbwstuttgart/typeinference/unify/model/WildcardType.java b/src/de/dhbwstuttgart/typeinference/unify/model/WildcardType.java
index 08c49783..9db59498 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/model/WildcardType.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/model/WildcardType.java
@@ -1,19 +1,30 @@
 package de.dhbwstuttgart.typeinference.unify.model;
 
+/**
+ * A wildcard type that is either a ExtendsType or a SuperType.
+ * @author Florian Steurer
+ */
 public abstract class WildcardType extends UnifyType {
 	
+	/**
+	 * The wildcarded type, e.q. Integer for ? extends Integer. Never a wildcard type itself.
+	 */
 	protected UnifyType wildcardedType;
 	
-	protected WildcardType(String name, UnifyType wildcardedType, UnifyType[] typeParams) {
-		super(name, typeParams);
-		this.wildcardedType = wildcardedType;
-	}
-
-	protected WildcardType(String name, UnifyType wildcardedType, TypeParams p) {
-		super(name, p);
+	/**
+	 * Creates a new instance.
+	 * @param name The name of the type, e.q. ? extends Integer
+	 * @param wildcardedType The wildcarded type, e.q. Integer for ? extends Integer. Never a wildcard type itself.
+	 */
+	protected WildcardType(String name, UnifyType wildcardedType) {
+		super(name, wildcardedType.getTypeParams());
 		this.wildcardedType = wildcardedType;
 	}
 	
+	/**
+	 * Returns the wildcarded type, e.q. Integer for ? extends Integer.
+	 * @return The wildcarded type. Never a wildcard type itself.
+	 */
 	public UnifyType getWildcardedType() {
 		return wildcardedType;
 	}