[jasim]

TDD is probably not the best way to do deep work. http://ravimohan.blogspot.in/2007/04/learning-from-sudoku-so...

About context, this is from Programmers at Work by Susan Lammers, interviewing John Page, author of the PFS productivity suite, famous in the late 80s.

Lammers: Why are programmers so obsessive?

Page: You constantly try to hold the state of the entire system you're working on in your head. If you lose the mental image, it takes a long time to get back into that state. It's like being an air-traffic controller who has nine planes in his mind and knows exactly where they're all going. Distract him by asking him when his shift is over and he loses those planes--the model he had in his head. In programming, a big complicated model is very efficient once you're in the groove. If you get out of it, you've got to work on it quite a while to get back in.