During the academic years 1972-1973 and 1973-1974, an intensive sem­ inar on the foundations of quantum mechanics met at Stanford on a regular basis. In particular, the articles by Bub, Demopoulos, and Lande, as well as the second article by Zanotti and myself, appear for the first time in the present volume.

Logic.- A Notion of Mechanistic Theory.- Essai sur la Logique de L’indeterminisme et la Ramification de L’espace-Temps.- How to Think Quantum-Logically.- The Conditional in Quantum Logic.- Empirical Logic and Quantum Mechanics.- Some Results from the Combinatorial Approach to Quantum Logic.- Probability.- The Quantum Probability Calculus.- The Probability Structure of Quantum-Mechanical Systems.- Towards a Revised Probabilistic Basis for Quantum Mechanics.- Probability in a Discrete Model of Particles and Observations.- Superposition and Macroscopic Observation.- A Note on the So-Called Yes-No Experiments and the Foundations of Quantum Mechanics.- Completeness.- On the Completeness of Quantum Theory.- The Einstein-Podolsky-Rosen Paradox.- Stochastic Incompleteness of Quantum Mechanics.- Errors in the No Hidden Variable Proof of Kochen and Specker.- Operator-Observable Correspondence.- Randomness and Locality in Quantum Mechanics.- Fundamental Statistical Theories.- Why the World is a Quantum World.- On the Determinism of Hidden Variable Theories with Strict Correlation and Conditional Statistical Independence of Observables.

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