Hi all, Alexei, I think the system group meeting went fine. I think the conclusion would be something like: We have slightly different opinions regarding interfaces (some parts of the interface group, guess who, wanted a strictly layered structure, where the optimization group is the mediator between us and the interface group). The other groups have 2 different levels of ambition, and we have 3. So, basically we have to discuss protocols and align our levels of ambitions. Everyone, if you want to read up on hibernate, this is a very short tutorial: http://www.javaworld.com/javaworld/jw-10-2004/jw-1018-hibernate_p.html The homepage of hibernate is hibernate.org, but the documentation is quite long, so go for the other page instead. See you, Markus