Hi guys We wanted to reuse metrics computation for example alves ratio (shown below) but for metrics imported from different tools like understand or sonar. calculateAlvesRatio “note that we do not know if this definition is correct but we want to reuse it" ^ self numberOfLinesOfCode / self lcom3 We wanted to avoid to reify all the metrics to avoid to blow memory (yes Cyril we the researchers are not totally dummy :). Here is a solution: double dispatch :) So tell us. FAMIXClass >> calculateAlvesLCOMRatio ^ (self family numberOfLinesOfCodeForClass: self) / (self family lcomForClass: self) MooseFamily >> lcomForClass: aClass ^ aClass lcom3 MooseFamily >> numberOfLinesOfCodeForClass: aClass ^ aClass numberOfLinesOfCode UnderstandFamily >> lcomForClass: aClass ^ aClass understand_LCOM UnderstandFamily >> numberOfLinesOfCodeForClass: aClass ^ aClass understand_LoC testClassLinesOfCodeWithMooseFamily "self nodeClass propertyNamed: #family put: FamixFamily uniqueInstance." self nodeClass familyClass: MooseFamily. self assert: self nodeClass numberOfLinesOfCode equals: 58. self assert: self nodeClass lcom3 equals: 10 / 11. self assert: self nodeClass calculateAlvesLCOMRatio equals: 319 / 5 testClassLinesOfCodeWithUnderstandFamily self nodeClass familyClass: UnderstandFamily. self nodeClass propertyNamed: #understand_LoC put: 85; propertyNamed: #understand_LCOM put: 11. self assert: self nodeClass calculateAlvesLCOMRatio equals: 85 / 11 Comments are welcome and code available at: MCSmalltalkhubRepository owner: 'Moose' project: 'Moose' user: '' password: ‘' 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