1. Introduction: The Need for Rationality. Part One. 2. Goodness of Fit. 3. The Source of Good Fit. 4. The Unselfconscious Process. 5. The Self-conscious Process. Part Two. 6. The Program. 7. The Realization of the Program. 8. Definitions. 9. Solution. Epilogue. Appendix 1. A Worked Example. Appendix. 2. Mathematical Treatment of Decomposition. Notes.