diff --git a/fr/istic/nplouzeau/cartaylor/api/CompatibilityManager.java b/fr/istic/nplouzeau/cartaylor/api/CompatibilityManager.java
index c5a753a..438b9c7 100644
--- a/fr/istic/nplouzeau/cartaylor/api/CompatibilityManager.java
+++ b/fr/istic/nplouzeau/cartaylor/api/CompatibilityManager.java
@@ -1,12 +1,8 @@
 package fr.istic.nplouzeau.cartaylor.api;
 import java.util.Set;
 public interface CompatibilityManager extends CompatibilityChecker {
-    void addIncompatibilities(PartType reference,
-    Set<PartType> target);
-    void removeIncompatibility(PartType reference, PartType
-    target);
-    void addRequirements(PartType reference, Set<PartType>
-    target);
-    void removeRequirement(PartType reference, PartType
-    target);
+    void addIncompatibilities(PartType reference,Set<PartType> target);
+    void removeIncompatibility(PartType reference, PartType target);
+    void addRequirements(PartType reference, Set<PartType> target);
+    void removeRequirement(PartType reference, PartType target);
 }
\ No newline at end of file
diff --git a/src/CompatibilityChecker.java b/src/CompatibilityChecker.java
new file mode 100644
index 0000000..22464db
--- /dev/null
+++ b/src/CompatibilityChecker.java
@@ -0,0 +1,19 @@
+package src;
+
+import java.util.Set;
+import fr.istic.nplouzeau.cartaylor.api.PartType;
+
+
+public class CompatibilityChecker implements fr.istic.nplouzeau.cartaylor.api.CompatibilityChecker {
+    
+    @Override
+    public Set<PartType> getIncompatibilities(PartType reference){
+        return Set.of();
+    }
+
+    @Override
+    public Set<PartType> getRequirements(PartType reference){
+        return Set.of();
+    }
+
+}
diff --git a/src/CompatibilityManager.java b/src/CompatibilityManager.java
new file mode 100644
index 0000000..6940924
--- /dev/null
+++ b/src/CompatibilityManager.java
@@ -0,0 +1,38 @@
+package src;
+
+import java.util.Set;
+
+import fr.istic.nplouzeau.cartaylor.api.PartType;
+
+public class CompatibilityManager implements fr.istic.nplouzeau.cartaylor.api.CompatibilityManager {
+    
+    @Override
+    public void addIncompatibilities(PartType reference, Set<PartType> target){
+    
+    }
+
+    @Override
+    public void removeIncompatibility(PartType reference, PartType target){
+
+    }
+
+    @Override
+    public void addRequirements(PartType reference, Set<PartType> target){
+
+    }
+    
+    @Override
+    public void removeRequirement(PartType reference, PartType target){
+        
+    }
+
+    @Override
+    public Set<PartType> getIncompatibilities(PartType reference) {
+        return Set.of();
+    }
+
+    @Override
+    public Set<PartType> getRequirements(PartType reference) {
+        return Set.of();
+    }
+}