Is it possible to have class variables in a Zope Product which : 1) are not stored in the object database 2) are reliably updated and retained throughout the life of a zope session when called by _bobo_traverse__() I've written an example Zope Product to investigate these issues and cannot determine a reliable way to achieve the desired results. '_v_name' values are only *sometimes* retained from one http get (via _bobo_traverse__() )to the next so those are out. I can't determine a pattern to when they are and when they are not. Sometimes, with two almost identical names, one's value is retained while the other's is not. 'name' values are *sometimes* retained from one get to the next within a _bobo_traverse__(), and again, I can't identify when or why. However, changes to 'name' variables are stored in the Zope database, so that's also out. Thanks