* This study was commissioned by the Stanford School of Education and was funded by a grant from The Wexner Foundation. The author is grateful to Lee Shulman, David Rosenhan, Arnie Eisen, Debbie Kerdeman, Isa Aron, and Elliot Dorff and a fruitful conversation that contributed much to it. These individuals have not endorsed any portion of its contents, however, the responsibility for which remains solely with the author.