I do agree. Test driven development really encourages the software to be more flexible since it allows to change the code immideately getting the impacts on the

I do agree. Test driven development really encourages the software to be more flexible since it allows to change the code immideately getting the impacts on the other parts of the system ( what is impossible without auto tests ); moreover once you test the code you try the interfaces and approach for usability, what improves the design speed and quality.