This volume contains the proceedings of the Fourth International Conference on Formal Engineering Methods: ICFEM 2002. The conference was held in Sha- hai, China, from 21 to 25 October 2002. Formal methods for software development have been extensively researched and their use in industry is increasing. Recent applications to the development of safety-critical, security-critical, and mission-critical systems have signi?cantly increased trustworthiness, without increasing overall development costs. ICFEM encourages the exchange of ideas on recent advances in formal methods and software...