Operations Research is a comprehensive book for undergraduate mechanical, industrial production and computer science engineers. The book explains how the science of operations research evolved out of the studies conducted during World War 2 and discusses the techniques and their applications to mass production and process flows. The book discusses how to use techniques such as PERT and CPM, as well as how to solve questions based on the traveling salesman problem. It contains a large number of solved and unsolved problems which cover all types of questions posed in the examinations and helps students understand how to solve them. The book is a must-have for all GATE aspirants.