Depends on what you mean by OO model. One of the most important things about Smalltalk is 'thisContext'. The various links referenced from: http://stackoverfl

Depends on what you mean by OO model. One of the most important things about Smalltalk is 'thisContext'. The various links referenced from: http://stackoverflow.com/questions/6347599/how-does-smalltalk-manipulate-call-stack-frames-thiscontext http://stackoverflow.com/questions/6347599/how-does-smalltal... Should give you a good idea. Basically, the current call stack is available. This makes it trivial to write a debugger, restart processing from a previous point in execution (debugger driven development as it is sometimes called makes the TDD process make so much sense when you do it in Smalltalk).