Hi! Ok, in a recent message I saw self.aq_acquire("some object"), that is extactly what I meant and needed. Why are the Acquisition classes so badly documented? Acquisition is a .so loadable module (for performance reasons, I presume) and I do not want to look into its C code to imagine what is done in Python ... Searching www.zope.org for "Acquisition" did not reveal anything better. OK, after disclaiming a little bit, I still have a problem: from Acquisition import Implicit from AccessControl.Role import RoleManager from OFS.Folder import Folder from Globals import Persistent class One(Implicit, Persistent, RoleManager, Folder): attribute = "Some text or something else" def somemethod(self): ob = Two() self._setObject("id", ob) ob.method() class Two(Implicit, Persistent, RoleManager, Folder): def method(self): print self.aq_acquire("attribute") one = One() one.somemethod() Leads toward an AttributeError because aq_acquire was not found in Two.method() Any help is very appreciated. Greetings -- Robert Sander www.gurubert.de