This book constitutes the refereed proceedings of the Third International Conference on Integrated Formal Methods, IFM 2002, held in Turku, Finland, in May 2002. The 18 revised full papers presented together with three invited papers were carefully reviewed and selected from a total of 46 submissions. The papers are organized in topical sections on integration, simulation, and animation; from specification to verification; statcharts and B: integration and translation; model checkers and theorem provers; links between object-Z and CSP; combining graphical and formal approaches; and refinement and proof.