This book concerns the 'cognitivist' or 'information processing' approach to psychology, what it is (was?), how it originated, and whether and how desirable it is to look for ways that go beyond it. The roots of cognitivism lie deep in the history of Western thought, and to develop a genuinely post-cognitivist psychology, this investigation goes back to presuppositions descended from Platonic/Cartesian assumptions and beliefs about the nature of thought. It then tackles the practical question of how might psychologists (and linguists and philosophers) 'do' post- cognitivism? Will the psychology go on with merely the 'theoretical backdrop' changed, or will post-cognitivism require the development of new approaches and new methodologies?