I.- One.- Self-Profile.- 1. Introduction.- 2. A Glance Over the Shoulder.- 3. Probability.- 4. Theory and Inference.- 5. Metaphysics and Ontology.- 6. Language and Logic.- 7. Value Theory.- 8. Social and Political Philosophy.- 9. Summary.- Two.- Kyburg's System of Probability.- Kyburg on Direct Inference.- Reply.- Three.- Bibliography of Henry E. Kyburg, Jr..- II.- One.- Self-Profile.- 1. Beginnings.- 2. Early Themes.- 3. Cognitive States.- 4. Revision of Knowledge.- 5. Credal Probability and Decision Making.- 6. Conditionalization and Revision of Probabilities.- 7. Inductive Logic.- 8. Statistical Probability and Direct Inference.- 9. Evidential Support.- 10. Unfinished Business.- Two.- Levi's Theory of Acceptance.- Levi on the Dogma of Randomization in Experiments.- Replies.- Three.- Bibliography of Isaac Levi.- Index of Names.- Index of Subjects.