[auxbuss]

This is my preferred method too. But a lot of developers struggle with the discipline of small, discrete, incremental changes, plus the dependence on solid testing skills. It also requires a culture that can support it. No blame, in particular.

However, if you have a team that is comfortable working this way -- and is only occasionally breaking things; it happens -- then it is a wonderfully creative, frictionless, and flexible way to develop.