diff --git a/library/Businessprocess/Storage/LegacyStorage.php b/library/Businessprocess/Storage/LegacyStorage.php
index b914de4..8c66e43 100644
--- a/library/Businessprocess/Storage/LegacyStorage.php
+++ b/library/Businessprocess/Storage/LegacyStorage.php
@@ -60,12 +60,7 @@ class LegacyStorage extends Storage
     }
 
     /**
-     * All processes readable by the current user
-     *
-     * The returned array has the form <process name> => <nice title>, sorted
-     * by title
-     *
-     * @return array
+     * @inheritdoc
      */
     public function listProcesses()
     {
@@ -85,12 +80,7 @@ class LegacyStorage extends Storage
     }
 
     /**
-     * All process names readable by the current user
-     *
-     * The returned array has the form <process name> => <process name> and is
-     * sorted
-     *
-     * @return array
+     * @inheritdoc
      */
     public function listProcessNames()
     {
@@ -110,9 +100,7 @@ class LegacyStorage extends Storage
     }
 
     /**
-     * All available process names, regardless of eventual restrictions
-     *
-     * @return array
+     * @inheritdoc
      */
     public function listAllProcessNames()
     {
diff --git a/library/Businessprocess/Storage/Storage.php b/library/Businessprocess/Storage/Storage.php
index 7d8ccb6..71a7faf 100644
--- a/library/Businessprocess/Storage/Storage.php
+++ b/library/Businessprocess/Storage/Storage.php
@@ -28,10 +28,41 @@ abstract class Storage
     }
 
     /**
+     * All processes readable by the current user
+     *
+     * The returned array has the form <process name> => <nice title>, sorted
+     * by title
+     *
      * @return array
      */
     abstract public function listProcesses();
 
+    /**
+     * All process names readable by the current user
+     *
+     * The returned array has the form <process name> => <process name> and is
+     * sorted
+     *
+     * @return array
+     */
+    abstract public function listProcessesNames();
+
+    /**
+     * All available process names, regardless of eventual restrictions
+     *
+     * @return array
+     */
+    abstract public function listAllProcessNames();
+
+    /**
+     * Whether a configuration with the given name exists
+     *
+     * @param $name
+     *
+     * @return bool
+     */
+    abstract public function hasProcess($name);
+
     /**
      * @param $name
      * @return BusinessProcess
@@ -39,10 +70,13 @@ abstract class Storage
     abstract public function loadProcess($name);
 
     /**
-     * @param BusinessProcess $name
+     * Store eventual changes applied to the given configuration
+     *
+     * @param BusinessProcess $config
+     *
      * @return mixed
      */
-    abstract public function storeProcess(BusinessProcess $name);
+    abstract public function storeProcess(BusinessProcess $config);
 
     /**
      * @param $name