> For that to work, there has to be, somewhere, a clear understanding of how the units all work together to achieve the higher-level goals without violating the

> For that to work, there has to be, somewhere, a clear understanding of how the units all work together to achieve the higher-level goals without violating the higher-level constraints which, in practice, increase in number and scope the higher up the pyramid of abstraction you go. Oh, that's an implementation detail. The market will sort it out.