Introduction: Decision making, Development of OR, Application of OR. Linear of Programming: Formulation of LP Models, Graphical solution, Simplex Method, Duality theory and application. Transportation Problem. Assignment Problem. Network models: Introduction, CPM and PERT, Crashing Networks. Waiting Line Models: Elements of queuing models. Poisson arrival and exponential service time distributions, M/M/1 Queue. Finite population models. Queuing cost models. Applications. Simulation: Simulation modeling, Use of random numbers, Flow chart development, Examples. Inventory Control: Introduction, Costs, Deterministic and Stochastic models: Buffer stocks.