This book is a enterprise inside the worlds of modeling and of metamodeling. At this degree, I can not disclose to readers what constitutes metamodeling. Suf fice it to say that the pitfalls and shortcomings of modeling could also be cured offered that we resort to a greater diploma of inquiry known as metainquiry and metadesign. We attain this diploma by the tactic of abstraction. The book incorporates 5 chapters from my earlier work, Utilized Widespread Strategies Idea (Harper and Row, London and New York, First Model 1974, Second Model 1978). Larger than ten years after its publication, this supplies nonetheless appears associated to the first thrust of system design. This book is dedicated to all these which might be involved in altering the world for the upper. In a way all of us are involved in system design: from the city supervisor who struggles with the problems of mass transportation or the consolidation of a metropolis and its suburbs to the social employee who tries to supply benefits to the town poor. It consists of the engineer who designs the shuttle rockets. It consists of the politician engaged in drafting a bill to recycle containers, or one to cease pesticide contamination of our meals. The politician might even need system design to chart his or her private re-election advertising marketing campaign.