diff --git a/src/multi_install/service/application_service.py b/src/multi_install/service/application_service.py
index 4946dbd..45227e8 100644
--- a/src/multi_install/service/application_service.py
+++ b/src/multi_install/service/application_service.py
@@ -1,4 +1,7 @@
-class ApplicationService:
+from multi_install.abc.application_service_abc import ApplicationServiceABC
+
+
+class ApplicationService(ApplicationServiceABC):
 
     def __init__(self):
         pass
diff --git a/src/multi_install/service/collection_service.py b/src/multi_install/service/collection_service.py
index 423fe22..8aff33d 100644
--- a/src/multi_install/service/collection_service.py
+++ b/src/multi_install/service/collection_service.py
@@ -1,4 +1,7 @@
-class CollectionService:
+from multi_install.abc.collection_service_abc import CollectionServiceABC
+
+
+class CollectionService(CollectionServiceABC):
 
     def __init__(self):
         pass