Thank you very much for all the support. A lot of it was warnings about the pitfalls facing me. There was an excellent email in support of Grok. I added that to the ZClass wiki. While I did not get any software written yet, I am pleased to say that I upgraded the Zope Wiki on ZClasses. Someone should find that helpful. It is clear that I have a very hard decision in front of me. Those of us who want to use ZClasses, have a very hard choice to make. Stay with a broken ZClass implementation, fix ZClasses and break Zope 2 and fork the Zope tree, or write a new version of ZClasses in Zope 3 and leave our legacy applications behind. I have been very happy with my Choice of Zope 2 many years ago. I now better understand its limitations. The problem is that whichever path I take, I have to live with it. Regards Chris