KeyWords : Business Objects, Persistency, ZODB. Hello all, I've been playing with Zope for a few weeks now...I really like it ! The problem I have is that, given a problem, I don't know what Zope technology I should use... Here is my problem : I have designed a small object application with UML. I then have implemented it in python. Only the business rules of my application are written yet (no UI nor GUI). The whole application source is made of 3 python files (.py). Python objects are persistent and stored into a file using the shelves mechanism (that I found to be very simple and handy). I test the core of my application in the console, invoking methods of my objects. Storage is correct, etc... Now that I know that my application "could" work (=all the business rules and methods have the correct behaviour), I want to access it through the web (=make a web application). I would like to use Zope to do so. First, I can modify my existing python code (to make it compliant with any Zope mandatory things - that I don't know yet !). [1 - Dealing with the Storage of my Objects] I don't want to deal with any Relational storage directly. I would like to go on using a full object approach : to have persistent python objects. Use of OQL would be nice, but not mandatory for my first needs. At last, I don't want to have to store/retrieve my objects from a SQL database by hand...The persistent mechanism should be as easy to use and handle as the shelves one(I don't need to use shelves in particular - I just want an object-storage mechanism). There is no need for me to have access to the today-existing datas (that were store in files from the shelves mechanism). [ 2 - Dealing with the visual HTML representation of my objects ] I would like to have a strong frontier between the rendering of data (=production of HTML code) and the logic of my application (=python code that handles the life of my objects). [ 3 - Reusability - Luxe ] I would also like to be able to use the same python code in both the console and web version (not mandatory). Given this, I don't know what Zope mechanism is best for me : ZClasses ?, ZCatalog ? External method ? Other ? Should I make a product ? Where can I put my existing python code ? How will I deploy it to several sites ? How do I store my business objects into ZODB ? If I am not clear enough : you can flame me ! I will explain it again :-) Please help ! Thanx for your support. Olivier Deckmyn, Paris - France.