This book constitutes the refereed proceedings of the First joint International Software Process Workshop and the International Workshop on Software Process Simulation and Modeling, SPW/ProSim 2006, held in Shanghai, China in May 2006. The 34 revised full papers presented together with 4 keynote addresses were carefully reviewed and selected from 225 initial submissions. The papers are organized in topical sections on process tailoring and decision-support, process tools and metrics, process management, process representation, analysis and modeling, process simulation modeling, process simulation applications, and experience report