diff --git a/browser/common.py b/browser/common.py
index 26ebba6..f341def 100644
--- a/browser/common.py
+++ b/browser/common.py
@@ -1,5 +1,5 @@
 #
-#  Copyright (c) 2010 Helmut Merz helmutm@cy55.de
+#  Copyright (c) 2011 Helmut Merz helmutm@cy55.de
 #
 #  This program is free software; you can redistribute it and/or modify
 #  it under the terms of the GNU General Public License as published by
@@ -278,6 +278,22 @@ class BaseView(GenericView, I18NView):
     def isPartOfPredicate(self):
         return self.conceptManager.get('ispartof')
 
+    @Lazy
+    def memberPredicate(self):
+        return self.conceptManager.get('ismember')
+
+    @Lazy
+    def masterPredicate(self):
+        return self.conceptManager.get('ismaster')
+
+    @Lazy
+    def ownerPredicate(self):
+        return self.conceptManager.get('isowner')
+
+    @Lazy
+    def personAssignmentPredicates(self):
+        return [self.memberPredicate, self.masterPredicate, self.ownerPredicate]
+
     @Lazy
     def url(self):
         return absoluteURL(self.context, self.request)