Hi I like the suggestion of daniel in Make PackageOrganizer>>packageOfClass:ifNone: and PackageOrganizer>>packageOfMethod:ifNone: return the most specific package it can find http://code.google.com/p/pharo/issues/detail?id=1752 Now I would like to have another pair of eyes on it. This is related to my idea of non overlapping package. Stef Fixed in: http://www.squeaksource.com/PharoInbox/PackageInfo-DanieRoux.35.mcz Took the fix from, and deprecated #mostSpecificPackageOfMethod:ifNone: and #mostSpecificPackageOfClass:ifNone: Background of problem: In theory it should not be possible for packages to overlap. Every class, and every method should belong to only one Category. In reality packaging bugs and other actions does cause packages to be created that overlap. An example in PharoCore, 10505 is this: (PackageOrganizer default packageNamed: 'Collections' ifAbsent: [ self error: 'hmm']) includesClass: Text. " true " (PackageOrganizer default packageNamed: 'Collections-Text' ifAbsent: [ self error: 'hmm']) includesClass: Text. " also true! " In the old implementation, #packageOfClass: would have returned the first category that matches. It will now return the more specific 'Collections-Text'. I suggest that #mostSpecificPackageOfClass* and #mostSpecificPackageOfMethod* methods be removed?