Hi! I analyzed a bit the presence and usage of abstract methods in Moose. MAVector>>initializeSize: is abstract. MOClusteringVector is a subclass of MAVector. MOClusteringVector does not override initializeSize: and is not subclassed. MOClusteringVector is therefore abstract without subclasses. Something has to be fixed somehow. I found a similar situation in Mondrian, and I fixed it. Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.