Associated reading: Paul Boghossian, "What the Externalist Can Know A Priori" Proceedings of the Aristotelian Society 97 (1997), 161-75. Also appears in C.Wright, M. Smith and C. Macdonald, eds., (1998) Knowing Our Own Minds:Essays in Self-Knowledge (electronic version will be provided) My paper, "What's Wrong with McKinsey-style Reasoning?" <http://www.jimpryor.net/research/papers/McKinsey.pdf> (retitle) (unset title)