pt. I. Background. 1. What Is Case-Based Reasoning? 2. Case Studies of Several Case-Based Reasoners. 3. Reasoning Using Cases. 4. The Cognitive Model -- pt. II. The Case Library: Representing and Indexing Cases. 5. Representing Cases. 6. Indexing Vocabulary. 7. Methods for Index Selection -- pt. III. Retrieving Cases from the Case Library. 8. Organizational Structures and Retrieval Algorithms. 9. Matching and Ranking Cases. 10. Indexing and Retrieval -- pt. IV. Using Cases. 11. Adaptation Methods and Strategies. 12. Controlling Adaptation. 13. Using Cases for Interpretation and Evaluation. 14. Using Cases: Some Additional Issues -- pt. V. Pulling It All Together. 15. Building a Case-Based Reasoner. 16. Conclusions, Opportunities, Challenges -- Appendix: A Case Library of Case-Based Reasoning Systems.