The "work outside in" strategy is ideal. Do this as much as possible. Alas, TDD requires precognition. Or such prior familiarity with the problem domain as to

The "work outside in" strategy is ideal. Do this as much as possible. Alas, TDD requires precognition. Or such prior familiarity with the problem domain as to make the effort redundant. Or performantive. Which is ok if you're managing upwards. Trying to impress those bozos who read the forward of some Agile Methodology books so now believe they are experts.