TAD has just about the right sound, too. I've found it's a useful tool for very specific tasks. I found TDD perfect for writing functions or modules with a wide variety of possible state-dependent outputs. While not strictly TDD, I've also found it helpful to sit down and frame a list of desired behaviors for a piece of code as expectations first, then go through the process of writing the code and tests in tandem. It's nice when you know exactly what you need to do, but not how to do it. It's much less helpful when you know the how but not exactly what.