diff --git a/src/CompatibilityManager.java b/src/CompatibilityManager.java
index 393e53a..798c073 100644
--- a/src/CompatibilityManager.java
+++ b/src/CompatibilityManager.java
@@ -6,7 +6,10 @@ import java.util.Set;
 
 import fr.istic.nplouzeau.cartaylor.api.PartType;
 
-public abstract class CompatibilityManager implements fr.istic.nplouzeau.cartaylor.api.CompatibilityManager {
+public class CompatibilityManager implements fr.istic.nplouzeau.cartaylor.api.CompatibilityManager {
+
+    private HashMap<PartType, Set<PartType>> incompatibilities;
+    private HashMap<PartType, Set<PartType>> requirements;
 
     @Override
     public void addIncompatibilities(PartType reference, Set<PartType> target){
@@ -116,7 +119,13 @@ public abstract class CompatibilityManager implements fr.istic.nplouzeau.cartayl
         }
     }
 
+    @Override
+    public Set<PartType> getIncompatibilities(PartType reference) {
+        return this.incompatibilities.get(reference);
+    }
 
-    public abstract Set<PartType> getIncompatibilities(PartType reference);
-    public abstract Set<PartType> getRequirements(PartType reference);
+    @Override
+    public Set<PartType> getRequirements(PartType reference) {
+        return this.requirements.get(reference);
+    }
 }
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