Hi Lukas. I was playing around RB (actually, looking at your screencasts) and I found something weird. Steps done: 1) Go to AST, "refactoring scope" -> "package" 2) There, took class RBReplaceRule and "refactor method" -> "rename" to the method initialize 3) Proceed -> yes There you will see the list of the initialize methods that it will apply the refactor. As you can see, all classes affected are RB, BUT Behavior and CompiledMethod. This is because the package AST has extensions to both classes. But NONE of those extensions are with the initialize method, but with parseTreeFor: and parseTree, So, my question is, shouldn't only apply the refactor to the initialize method of extended packages ONLY if that method is extended ? Because otherwise I think it is a bit dangerous. What do you think ? I attach screenshot also. Cheers Mariano