sentences:  Published in 1984 by Holt, Rinehart, and Winston, it features a foreword by Asimov, the creator of the Three Laws of Robotics.In addition, each story has introductory notes by Warrick, author of "The Cybernetic Imagination in Science Fiction", explaining the significance of the story in the context of science fiction's evolution of ideas concerning artificial intelligence.This book is a companion piece to that book, providing the source material upon which Warrick's analysis is based.