Hi All, This is particularly problematic when using the common case of SQLAlchemy declaratively mapped model classes. The attached unit test when run will fail with: Error in test test_provideAdapter (test_sa.TestAdapter) Traceback (most recent call last): File "/usr/local/lib/python2.6/unittest.py", line 279, in run testMethod() File "test_sa.py", line 25, in test_provideAdapter provideAdapter(MyAdapter,Model) File "zope.component-3.10.0-py2.6.egg/zope/component/globalregistry.py", line 72, in provideAdapter base.registerAdapter(factory, adapts, provides, name, event=False) File "zope.component-3.10.0-py2.6.egg/zope/component/registry.py", line 182, in registerAdapter required = _getAdapterRequired(factory, required) File "zope.component-3.10.0-py2.6.egg/zope/component/registry.py", line 414, in _getAdapterRequired for r in required: TypeError: 'DeclarativeMeta' object is not iterable Why is that and how should I register an adapter against such a class? cheers, Chris -- Simplistix - Content Management, Batch Processing & Python Consulting - http://www.simplistix.co.uk