Hi guys Ideally I would like to add a simple and little package with DisplayableObject because I do not want to put it in the System-Model package. I was wondering what is the impact on the bootstrap and I think that the impact is null since BaselineOfBootstrap does not contain System-Model but only UIManager. Now I found in the rule checker that System-Model is listed there and I found that it could be a desync between the information. What do you think? Now I have the impression that for now I could try to keep DisplayableObject with Model in System-Model and see how it goes. Because the decomposition between the different baseline is still something that need some iterations. Stef bootstrapPackages ^ #( #'AST-Core' #'Announcements-Core' #CodeExport #CodeImport #CodeImportCommandLineHandlers #Collections #Compression #'FileSystem-Core' #'FileSystem-Disk' #Files #Jobs #Kernel #Monticello #'Multilingual-Encodings' #'Multilingual-Languages' #'Multilingual-TextConversion' #'Network-UUID' #'OpalCompiler-Core' #'Random-Core' #'RPackage-Core' #'Ring-Deprecated-Core-Containers' #'Ring-Deprecated-Core-Kernel' #'Ring-Deprecated-Monticello' #'Ring-Deprecated-ChunkImporter' #'Slot-Core' #'System-Announcements' #'System-BasicCommandLineHandler' #'System-Changes' #'System-CommandLine' #'System-CommandLineHandler' #'System-Finalization' #'System-Hashing' #'System-Localization' #'System-Model' #'System-Platforms' #'System-SessionManager' #'System-Sources' #'System-Support' #Traits #'Transcript-Core' #UIManager #'Collections-Abstract' #'Collections-Arithmetic' #'Collections-Native' #'Collections-Sequenceable' #'Collections-Stack' #'Collections-Streams' #'Collections-Strings' #'Collections-Support' #'Collections-Unordered' #'Collections-Weak' #'Zinc-Character-Encoding-Core' #'Zinc-Resource-Meta-Core' #'PharoBootstrap-Initialization' #'Transcript-NonInteractive' ) Stef