This chapter attempts to vindicate what is sometimes pilloried as the “Received View” of realization and multiple realization in the philosophy of mind. Using the Dimensioned view of realization, it proceeds to give three “mechanistic” accounts of how multiple realization is possible. There is what might be called multiple realization with individual variation, multiple realization by compensatory differences, and multiple realization by orthogonal realizers. It, then, shows how this multiple realization leads to a kind of autonomy of psychology, while nonetheless integrating neuroscience and psychology. It also shows how one might avoid “Keeley’s Dilemma” regarding the relationship between neuroscience and psychology.