Preface; Part I: Introduction; 1. The scope of decision sciences; 2. Problem finding and alternative generation; Part II: Individual Decision Making; 3. Prediction and inference; 4. Valuation and choice; 5. Evaluating prescriptive approaches; Part III: Multi-person Decision Making; 6. Group decision making; 7. Formal models of group decision making; 8. Organisational decision making; 9. Societal decision making; Part IV: Epilogue; References; Appendices.