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เนื้อหาย่อ : This book represents a revision and extension of material originally published in the summer of 1976 under the the aegis of the Insti titute for Software Engineering, Inc. It was made available at the time only through Institute memberships and with courses sponsored and taught by the Institute. This edition is thus the first full exposition of the theory of software physics to be made generally available in the literature. The basic importance of the theory, and of this book, lies in its demonstra- tion that only three fundamental properties are sufficient to describe every quan- tative operational characteristic of software and computing equipment which is of interest in software enginee ering. As in the natural physics, the understanding of what properties are fundamental, and a precise notation for expressing relationships, give the overall theory the ability to assimilate new discoveries and ideas into a coherent body of knowledge. The major revisions incorp porated in this edition reflect the progress made in the last several years in the understanding and engincering use of the basic theory. The primary area of revision is in the analysis of I/O system capacity and per- formance. Mr. Roger Kovach is largely responsible for the treatment of the subject given in this book. Similarly, Mr. Victor Soder and others have made significant contributions to instrumentation and experiment design techniques. Mr. Soder has updated and modernized much of the material presented here.