It Is Our Pleasure.

The article comments on the July 1972 issue of the journal "Communications of the ACM," which is devoted to the 25th anniversary of the Association for Computing Machinery. This issue was produced with constraints like time and budget and the editorial team hopes that the finished product contains material which, in whole or in part, will be of current interest to all the readers of the journal and of lasting interest to many. This issue has been produced with the cooperation of several scholars of the related field. The ultimate responsibility for the success of this issue lies with the many authors and contributors who have contributed their work. Special gratitude has been paid to the ad hoc committee responsible for the technical contents of this issue including, Roman Weil, as Chairman, Robert Ashenhurst and William Timlake and to Cherie Weil for her secretarial help and to the many referees for their very professional assistance. This these people devoted great time in reviewing and editing the papers received for publication.