There are three hooks that object managers call when adding deleting and cloning objects. I've written some documentation for these at: http://www.zope.org/Members/michel/Projects/Interfaces/ObjectManagerItem Note that manage_afterClone is often implemented needlessly. There are currently cases of this in the Zope distribution. Sigh. Hopefully, this documentation will clarify. (If not, fix it! ;) Jim -- Jim Fulton mailto:jim@digicool.com Technical Director (888) 344-4332 Python Powered! Digital Creations http://www.digicool.com http://www.python.org Under US Code Title 47, Sec.227(b)(1)(C), Sec.227(a)(2)(B) This email address may not be added to any commercial mail list with out my permission. Violation of my privacy with advertising or SPAM will result in a suit for a MINIMUM of $500 damages/incident, $1500 for repeats.