The modal interpretation explained here construes the mathematical formalism of quantum mechanics in terms of physical properties (‘‘be-ables,’’ ‘‘existents’’) in such a way that the property attribution reflects the mathematical structure as much as possible—no additional structure is superimposed on the formalism. We generalize the interpretation by specifying a dynamics of physical properties, and also extend it while replying to recent objections by Albert and Loewer 2 [Proceedings of the 1990 Biennial Meeting of the Philosophy of Science Association, edited by A. Fine, M. Forbes, and L. Wessels (Philosophy of Science Association, East Lansing, MI, 1990), Vol. 1, p. 277], and by Elby [Found. Phys. Lett. 6, 5 (1993)]. I also discuss questions relating to relativistic aspects and casuality.

• Received 23 July 1993

DOI:https://doi.org/10.1103/PhysRevA.49.2290