Hi there, Here at the Grok dependency reduction sprint Sylvain and Wolfgang have been working on a buildout recipe called 'z3c.recipe.compattest': http://pypi.python.org/pypi/z3c.recipe.compattest What this brings to Zope development is a way to test changes in one package against a lot of other packages to check whether things haven't been broken by your change. It will download each package and run the tests per package (in a separate process so that tests don't have hidden dependencies on each other). It can test against releases on PyPI or take the trunks of packages on svn.zope.org. We're currently running it through paces and work out any problems with it, but I think it'll be quite useful for people working on larger-scale changes that could potentially affect many packages. We've used it to find all kinds of incompatibilities that were created between packages already, and have been fixing some of them. Regards, Martijn