Preface; Part I. Introduction and Overview: 1. Introduction; Part II. The Inductive Assertion Method: 2. Floyd's inductive assertion method for transition diagrams; 3. The inductive assertion method for shared-variable concurrency; 4. The inductive assertion method for synchronous message passing; 5. Expressibility and relative completeness; Part III. Compositional Proof Methods: 6. Introduction to compositional reasoning; 7. Compositional proof methods: synchronous message passing; 8. Compositional proof methods: shared-variable concurrency; Part IV. Hoare Logic: 9. A proof system for sequential programs using Hoare triples; 10. A Hoare logic for shared-variable concurrency; 11. A Hoare logic for synchronous message passing; Part V. Layered Design: 12. Transformational design and Hoare logic; Bibliography; Glossary of symbols; Index.