Hi, Lots of progress on the Reflectivity project⦠What is now working is this: 1) define a simple âHalt onceâ link: haltLink := MetaLink new metaObject: Halt; selector: #once. 2) install on the GlobalVariable that is referencing class Object: Object binding link: haltLink. 3) enable haltOnce in the system Menu â> next time the global variable âObjectâ is accessed, you get a halt. Keep in mind that lots of things are not yet working⦠but every day some progress. trello board is here: https://trello.com/b/m5cxaAxB/reflectivity Next big issues to fix - #after and #instead for LiteralVariable - links on Slots and Temps - more tests - classes should be able to define which methods should use meta-recursing stopper - make "Object methods do: #createTwin. Object methods do: #invalidate.â work Marcus