Operation Research (OR)- a branch of applied mathematics has wide applications in real life situations. It has always played important role in specific and objective decisionmaking either be industry, agriculture, business or any other sphere of economy. The development and application of OR has been increasing both in intensity as well as in scope. The main aim is to present a simple, systematic and comprehensive exposition of the principles, methods and the wide variety of practical utility of its manifold techniques that are commonly used as to hold a clear concept. Also, to acquaint the readers with basic knowledge of the various structures and processes involved. The book is designed in such a way that it encompasses the needs of the students of Commerce and Management at both P.G and U.G Levels.