M. J. Cresswell is a logician and philosopher of language who has been a major continuing influence on the growth and development of formal semantics over the past 15 years or more. This book is the outgrowth of years of work on propositional attitudes, the hardest problem in semantics. In it, he traces the problem to the foundations of semantics and solves it by distinguishing between the result of the composition of the simple parts of complex expressions and structure consisting of the uncomposed parts.Cresswell explains the basis of the great intuitive appeal of structured meanings, and why previous attempts, from Carnap's notion of intensional isomorphism on, to use them to solve the propositional attitudes problem have been unsuccessful. His own formalization is integrated into a model-theoretic framework which is capable of incorporating and extending all the insights obtained from Montague's semantics.M. J. Cresswell is Professor of Philosophy, Victoria University of Wellington, New Zealand. He is the author of Logics and Languages, in which he developed an alternative version of Montague Grammar, as well as many articles on possible-worlds semantics; and coauthor with G. E. Hughes of An Introduction to Modal Logic and A Companion to Modal Logic, the standard works in the field.A Bradford Book.