This book constitutes the refereed proceedings of the International Workshop on OpenMP Applications and Tools, WOMPAT 2001, held in West Lafayette, IN, USA in July 2001. The 15 full papers presented were carefully reviewed and revised for inclusion in the volume. The book presents a state-of-the-art overview on OpenMP shared memory parallel programming. The papers are organized in topical sections on benchmarking, compiler implementation and optimization, tools and tool technology, OpenMP experience, NUMA machines and clusters, and OpenMP extensions.