This volume contains papers on software for high performance parallel computation. Their purpose is to evaluate the current state of the art in software for parallel computation, identify the main factors inhibiting practical applications of parallel computers, and suggest possible remedies. In particular, they focus on parallel software, programming tools, and practical experience of using parallel computers for solving demanding problems. Critical issues relative to the practical use of parallel computing include: portability, reusability and debugging, parallelization of sequential programs, construction of parallel algorithms, and performance of parallel programs and systems. Several tools are described for the first time in this book, and several papers are by outstanding contributors to the field ofhigh speed programming. Highlights include papers on PVM and HeNCE, FORGE 90and High Performance Fortran, Linda, and object oriented programming methods.