Zopistas, After fooling around a bit (a rather big bit, I might add (possibly even a byte)), I have come across something not mentioned in the docs. (Surprise!) My starting point is this: I want to create a superclass, which has the properties inherited by all the subclasses, like this: Software | |--Application | |--Game All software has properties that can (and should) be superclassed, like software_title, software_publisher etc. I tried to create ZClasses within ZClasses, but when I instantiate an object of the type Game, I can only edit the variables set specifically in Game, not the properties that should be inherited from Software. I want to superclass as many variables as possible, to avoid duplication of work. Most of the subclasses have 2 or 3 unique variables, all others are common. I am familiar with common OO parlance, but Zope is weird in some ways. I suppose the properties are inherited in the above example, but I want to be able to override the values from Software with instance variables/properties/whatever. And to edit them (the inherited properties) from the built-in zope manage form. How do I do this? Additionally, is there a way to automagically generate an addForm method AFTER editing the propertysheet for that class, to reflect the new variables (I'm getting tired of updating the HTML by hand every time :) Regards, Alexander.