If you want to know a little bit more about TDD styles, you can read this beautiful post: TDD – From the Inside Out or the Outside In?
Very interesting thoughts about Four Rules of Simple Design based in Game of Life Kata.
I agree with most of the conclusions and the review of Simple Design Rules.
Little ‘but’ ahead… In my opinion, I see in the final examples, a little bit of ‘magic’ and some jumps in the flow we were following with the author.
It’s a good booklet, you can read it very quickly and you take very clear and useful information.
I’m writing right now a more extended post with detailed comments. Stay tuned!