I find that I learn tons when watching other people develop, especially when they communicate their intentions as they work. I think this is what makes pair programming so valuable. This set of videos has Brett, implementing a code algorithm called Shunting Yard. The algorithm is well established and has been solved many times. The purpose is to practice the mechanics of TDD just like martial artists who practices repetitive fluid movements so they become second nature. It is interesting to see how Brett structures his test fixture to reduce duplication, similar to how I created an extension method in my string calculator video.