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This is an expanded version of a paper prepared for a symposium at the July 1985 ASL Meeting at CSLI. Certain examples reflect the fact that the paper was originally prepared to be read to an audience. The thoughts recorded here reflect many conversations over a period of years with Jon Barwise on the topics of situation theory and possible worlds, as well as participation in a seminar on Inquiry with John Etchemendy, Bob Moore, David Israel, Ned Block, and others.