Hi, The Slots project contains not only Slots, but in addition âFirst classâ Globals, too, Pharo4 now contains an example: ExampleClassVariable, this class defines the ivar (slot) âstateâ. read ^state write: anObject state := anObject we can create a class defining a class var like that: Object subclass: #TT slots: { } classVariables: { #ClassVar => ExampleClassVariable } category: âPlayGround' Like with slots, the variable reads and write generate code to call the reflective read and write methods: 21 <20> pushConstant: ##ClassVar 22 <D1> send: read 23 <7C> returnTop and the write: 21 <10> pushTemp: 0 22 <69> popIntoTemp: 1 23 <20> pushConstant: ##ClassVar 24 <11> pushTemp: 1 25 <E1> send: write: 26 <87> pop 27 <78> returnSelf Full list of changes: - cleanup: moving all Reflectivity related code from Slot package to Reflectivity package - fix code generation to not use Object>>#writeToGlobal: but instead the idea with the temp as seen above - add example for Class Variable Marcus