Hi Apparently some class extensions category are stored in lowercase, and this makes difficult to find a package given a method category. methodCategoryPrefix ^ methodCategoryPrefix ifNil: [methodCategoryPrefix := '*', self packageName asLowercase] I would be nice to make sure that we can go from a package to its class extensions and from the class extensions to its package. Now using asLowercase breaks this dual relationship. What do you think? Ideally I would like to fix all the package extensions to reflect exactly their package name and also change the code above to ensure that we get a real bijection. Stef