[unclebobmartin]

I agree that in a startup software needs to be incredibly malleable, and the developers can expect to be constantly refactoring and throwing away big chunks of code. That's precisely what TDD helps you do. You _can not_ refactor without a suite of tests to protect you; all you can do is hack.

If you need your code to be malleable, for God's sake make sure you have a suite of tests you trust with your life. Otherwise you'll be slowed down by the fear that you'll break the code.