“If rewards come from solving problems and if different people have differing capacities for solving different types of problems, then disputes as to what problems most require solution can only be expected. Engineers and accountants, to take an obvious example, differ widely in the type of problem that they can solve competently. They notoriously disagree on whether the reverse salients blocking the growth of a particular enterprise are financial or technological in nature. Similarly, engineers with different skills and types of experience may also disagree on whether, for example, the technological reverse salients are hardware problems or software problems.”