Three working seminars resulted in this book which includes edited versions of 25 prepared papers and 12 workshop reports. The seminars identified political, economic, and managerial issues involved in building and operating computer networks on a national basis. There are four parts to the book. Part I contains an introductory chapter framing some of the questions considered, a chapter outlining selected highlights of issues discussed, and a chapter summarizing the chief conclusions and recommendations of the 152 seminar participants. Parts II, III, and IV contain the edited papers and reports of seminars 1, 2, 3, in that order. Additional conclusions and recommendations of individuals and workshops appear throughout the papers and reports of Parts II, III, and IV. (WCM)