...is to run them all before you do a release, surely? Try this in a fresh 2.4.0 final install on windows: E:\Zope\2.4.0>bin\python utilities\testrunner.py -a ...which will run all the unit tests in the Zope install. The results are not good :-( Well, I'm gonna see how many failures I can fix and stick them all in the collector. Watch this space... cheers, Chris