Interesting Talk: "Fractal TDD: Using tests to drive system design" (2nd)

I've just revisited this great Steve Freeman's talk:

• Fractal TDD: Using tests to drive system design

I'm also revisiting his book in the light of what I've practiced in the last 9 months and what I've learned in the BeCode Agile Development course. I hope this time I'll understand it a bit better.