Because it's AOSD, I sat down and optimized ContextS2 somewhat (layered method executions should be around 3x faster than before ... which is still around 80x slower than non-layered methods on Cog). I also fixed the tests on Pharo 1.4 So, ContextS2 should now run from Squeak 4.2 onwards and on Pharo 1.4 If you use it and find problems, please report bugs! Enjoy, Tim