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There is no main. Rather than writing programs, you construct objects. Rather than running programs, you test objects. A Smalltalk environment will have several browsers up at a time. Some for browsing, others for editing. Another typical scenario is to have several *workspaces* up at the same time. A little code here, a few tests there.

I think Patrick's right - not having main() is a large part of the productivity question. Ironically, it's also one of the things that make Smalltalk hard to introduce to people - a common complaint from experienced developers, after their first encounter with Smalltalk is Where's my program? Once you get beyond that - and realize that you are holding clay - clay that you can mold into any shape you want - is when you really start to become productive.