frankly I dont see why people keep linking this design document. Google has no clue about good design as most software companies, they definitely droped the ball in that area with Android. But that is my opinion. Pharo can be definetly be improved in several areas but it has been already a huge improvement over Squeak. So I am not afraid of Pharo design wise its on a good road and I try to also give it a helping hand :)��