[M]aster entrepreneurs rely on what [study author Saras Sarasvathy] calls effectual reasoning. Brilliant improvisers, the entrepreneurs don't start out with concrete goals. Instead, they constantly assess how to use their personal strengths and whatever resources they have at hand to develop goals on the fly, while creatively reacting to contingencies. By contrast, corporate executives—those in the study group were also enormously successful in their chosen field—use causal reasoning. They set a goal and diligently seek the best ways to achieve it. Early indications suggest the rookie company founders are spread all across the effectual-to-causal scale. But those who grew up around family businesses will more likely swing effectual, while those with M.B.A.'s display a causal bent. Not surprisingly, angels and seasoned VCs think much more like expert entrepreneurs than do novice investors.