Why a FamixClassGroup does not know this message? In fact it knows totalNumberOfLinesOfCode But numberOfLinesOfCode is defined on model. So is there a way to convert a group into a model? Don’t do that. I migrate the numberOfLinesOfCode to AbstractMooseGroup and deleted totalNumberOfLinesOfCode which is now in duplication of numberOfLinesOfCode. Vincent Hi vincent I cannot reply easily I have to understand why I do not receive the moose mails in my mail client. Now - This is important to have numberOfLinesOfCode in a model because I need that too. Because from a class how can I reach all the class of a model? - you should not “migrate” behavior like that without discussion. Stef -------------------------------------------- Stéphane Ducasse http://stephane.ducasse.free.fr http://www.synectique.eu / http://www.pharo.org 03 59 35 87 52 Assistant: Julie Jonas FAX 03 59 57 78 50 TEL 03 59 35 86 16 S. Ducasse - Inria 40, avenue Halley, Parc Scientifique de la Haute Borne, Bât.A, Park Plaza Villeneuve d'Ascq 59650 France