This book provides guidance to the administrative personnel on how economic principles and theories can be applied to ensure the most efficient performance of their engineering functions. The engineering function' involves the activities and works of designing and constructing machinery, engines, electrical devices, and roads and bridges. The performance of all these activities involves financial, human and time costs and yields benefits to the performers of these activities and to the society as whole. A comprehensive analysis of how economic concepts and economic theories can be applied to resolve the economic problems confronted by the people as consumers, producers, factor owners, and marketers has been provided in the first edition of this book. In this new edition, some important contributions have been to the subject matter of the Engineering Economics to make its scope more comprehensive.