Dan, is this book going to provide a substantial, coherent and timely contribution to CSCW or is it just going to be a ragbag of papers from several meetings stuck together? The latter, of course, Colston. However, . . . . . . and the "However" was rather long and technical, but not substantially different in overall content from that of this pref ace. Most of the papers contained in this book were initially presented at meetings organized by the UK's Computer Supported Cooperative Work (CSCW) Special Interest Group in 1991, but the book is not a proceedings, whatever the above quo tation suggests. Readers will immediately notice that, unlike typical proceedings, all the references are placed together at the end of the book and that there is a substantial index: the hall mark of all proper, technical books of quality. If you choose to delve further than this preface, you will find that each chapter is cross-referenced, thus you also gain a coherent structure across chapters - an advantage traditionally associated with high quali ty single-author books. Furthermore, turning apparent disadvantage to advantage, while single-author books must inevitably present the idiosyncratic perspective of their author, in this book, and appropriately for a young area such as CSCW, you will be presented with the views of a dozen CSCW experts who all have considerable, hard-won experience, gained over many years.