Hi, I just want to hold some data structures in the session data. The application I want to write gatheres data from a database according to several options which can be set in a several step menu system. I have to keep track to the options. After reading /Examples/ShoppingCart of the Zope hierarchy I tried to adopt this scheme of data tagged by keys in the session data but I found out that I lost overview about this stuff if I would dive deeper into the data structure I would need. I thought I would find the solution in defining my own class variables and found out that this is not possible in Python scripts for security reasons. Next I tried External Python methods but I've got strange effects with this approach and I think it would not work as well. I thought I would find the solution at http://www.zopelabs.com/cookbook/991933953 but I just got an error right in the first line of the example code: Zope has encountered an error while publishing this resource. Error Type: ImportError Error Value: import of "Products.PythonScripts.Utility" is unauthorized So I have two questions: 1. Is this the right approach to accumulate several data in the session variable even if there is a more complex menu structure of options which are sometimes dependand one from some others. 2. If yes what is the best way to get this working. Kind regards Andreas.