Hi, Yesterday Camille did the change to finally remove the old class builder! (just a removal + a small change to NativeBoost to use the new class builder to create anonymous classes). This means - 1000 Loc of completely un-understandable code removed. - we now 100% run on the new class builder from the Slot Project. Next on the list (not all for Pharo3): - remove PackageInfo - old Browser + CodeHolder hierarchy - PseudoClass&Co â> Ring - old AST+Compiler (this in Pharo4) We already did (all in Pharo3): -> remove URI -> deprecated Url for ZnUrl -> removed HTTPSocket facade -> MIMEType retired for ZnMimeType -> old Debugger is removed -> Class categories are replaced by Protocols I am quite sure that these cleanups will enable us to build a lot of very interesting things in the future. Marcus