I am playing with the idea of Test Driven Builds for a while now. This is ultra-agile.

But let me explain it first: A Test Driven Build builds your application based on your Functional and Integration tests (but not the Unit tests!). For each test the compiler looks up and compiles the required classes, and only those. Obviously, it keeps the previously compiled ones as well, and after running all your tests it packs all of them together, so you would have the application which can run your tests.

I don’t usually take this idea seriously, but actually this can be the next step on the agile path. Should I have the knowledge to create such a build tool, I would. Just for fun. It would be interesting to see whether people would try to use it.  I’d be curious about their experience and opinion.