I have updated this material, based on the public comments: Front matter Chapter 1, Introduction Chapter 6, Groups, Contexts, Communicators, and Caching Chapter 11, One-sided Communication I would like some reviewers for the first 3 (I've made the RMA chapter available to the RMA group). These three chapters do have chapter committees, but they've been inactive, so I'd like some volunteers. I have the svn diffs of the chapters as well as the PDF for the chapters, with the updates in color. The changes are almost all minor typos, with a few corrections (e.g., there was one statement about the inability to add processes to an MPI job that was true in MPI 1 but hasn't been true since MPI 2.0). Let me know if you can help. Thanks! Bill William Gropp Director, Parallel Computing Institute Deputy Director for Research Institute for Advanced Computing Applications and Technologies Paul and Cynthia Saylor Professor of Computer Science University of Illinois Urbana-Champaign