This book constitutes the refereed proceedings of the 5th International Conference on Foundations of Software Science and Computation Structures, FOSSACS 2002, held in Grenoble, France, in April 2002. The 28 revised full papers presented together with an extended abstract of an invited paper were carefully reviewed and selected from a total of 67 submissions. Among the topics addressed are algebraic, categorical, logical and geometric theories, models and methods which support the specification, synthesis, verification, analysis and transformation of sequential, concurrent, distributed and...