So you recommend that I should just skip them as long as I'm on Zope2?
I would be happy with that. I find them confusing when they don't really interface with but just document my methods.
Some of the reasons interfaces can be helpful are (1) for documentation purposes and clarity for code if someone needs to look at it, (2) if other classes might use the same interface, you help make sure you're sticking to a common interface so that the methods in different classes do similar things, and (3) you can use methods like "isImplementedBy" so that certain templates, code, etc. does something with an object or class if it uses the interface -- what you call "really interfacing". There's many examples of how (3) might work. It seems like for now that (3) won't be important to you and (2) might be. Personally I define interfaces for some classes (especially tools) to help with the documentation, but agree with you that for other straightforward classes they don't help that much with documetnation. Hope this helps; peace, George