This publication deals with Computer Science and models of Concurrency. It particularly emphasizes on hardware/software co-design and the understanding of concurrency that results from these systems. A range of papers on this topic have been included, from the formal modeling of buses in co-design systems through to software simulation and development environments. The book includes a contribution by Professor Sir Tony Hoare, the founding father of the theoretical basis upon which much of the work in this series is based. He shares his new thoughts on fine-grained concurrency. Another important contribution is by Professor David May. He was chief architect for the Transputer and the Occam programming language. The editors trust you will find this publication informative and inspirational.