Article on OBIEE Multi-User Development
Whilst I remember it, Venkat has written up another excellent OBIEE article, this time on performing multi-user development against an OBIEE repository.
This uses the new "Projects" feature introduced in a recent release of OBIEE, and allows individual developers to "check out" logical fact tables and their corresponding dimensions, make some changes and check them back into the central repository. I've certainly been asked about this on training events in the past, take a look if this is something you're looking to do.