Preface to the revised edition; Preface and acknowledgements; Part I. Perfect Rationality: Beyond Gradient-Climbing: 1. Introduction; 2. The locally maximizing machine; 3. The globally maximizing machine; 4. Strategic behaviour in animals and men; 5. Functionalist explanation in sociology; Part II. Imperfect Rationality: Ulysses and the Sirens: 1. Introduction; 2. Towards a definition; 3. Pascal; 4. Descartes; 5. Inconsistent time preferences; 6. Endogenous change of preferences; 7. Precommitment in animal behaviour; 8. Abdication from power; 9. Some conclusions and further questions; Part III. Problematic Rationality: Some Unresolved Problems in the Theory of Rational Behaviour: 1. Introduction; 2. Games without solutions; 3. Lexicographic preferences; 4. Subjective probability; 5. Maximizing, satisficing and natural selection; 6. Traditional behaviour and random behaviour; 7. Explaining altruism; 8. Inconstancy; 9. Paradox; 10. And so what; Part IV. Irrationality: Contradictions of the Mind: 1. Introduction; 2. Hate; 3. Love; 4. Self-deception; References; Index.