Part I. Background.- Chapter 1. Introduction .- Chapter 2. Calculus of consent .- Chapter 3. The majority rule.- Chapter 4. Necessary and sufficient conditions.- Part II. Systems: their evaluation and justification.- Chapter 5. More than two alternatives.- Chapter 6. Strategic aspects .- Chapter 7. Sequential voting by veto .- Chapter 8. Criterion based choice of rules .- Chapter 9. The stability of voting rules.- Chapter 10. Two methods based on...