Hi, we should decide how we will manipulate with tools. A lot of tools classes are referenced directly - that is wrong because you cannot then use different set of tools (for example a dummy toolset for no tools at all). In the KernelImage I added a registration mechanism for tools so they were called for example ToolSet default browser. There were no ToolSet subclasses and there was only a test if the default ToolSet is not nil. That was not optimal solution. The current philosophy of ToolSet class supposess that you will send messages directly to ToolSet class and you will not get real tools classes at all. However the set of this messages would be very long and Squeak wants sometimes directly the class (for comparison etc.) The default tools are: browser changeList changeSorter changedMessageSet classCommentVersionsBrowser classListBrowser debugger dualChangeSorter hierarchyBrowser instanceBrowser lexicon messageNames messageSet packagePaneBrowser pointerFinder protocolBrowser versionsBrowser Cheers, -- Pavel