Hi Adrian, "stub" refers to those entities that are not part of the system under analysis, but that you want present for the model to be complete. For example, if I have a class A that inherits from Object, and I only want to analyze A, I will have in the model both A and Object because like this I can reason about the inheritance of A. belongsTo is to a Namespace, not to a Package. A Class is packagedIn a Package. In general, in the case of a 1-to-n relationship the MSE should rather state the n end of the relationship. So, in the above case, you should should state the Class belongsTo, and packagedIn, rather then adding the pointer to the class in the Namespace class, or Package definedClass. The properties that are not required are described as derived. In the above case, Package definedClass is a derived property (actually, it was not, but I corrected this in the latest version of Moose). To see only the derived properties from FAMIX, you should use "Tools/Moose Utilities/UML of Strict FAMIX meta-model" menu entry from the VW launcher. I also updated the picture from the Wiki with the strict one: http://smallwiki.unibe.ch/moose/famixmetamodel/ Doru -- Tudor Girba www.iam.unibe.ch/~girba www.iam.unibe.ch/~girba/blog/ "No matter how many recipes we'll know, we'll still value a chef."