The 13* edition of the book titled "Operations Research" by Prof. Kanti Swarup, Dr. P K Gupta, and Dr. Man Mohan, is a very comprehensive coverage of the subject with particular emphasis on the solution of socio-economic problems arising in management sciences. Besides, the book caters to the needs of students of Mathematics, Statistics, Engineering, Economics, and Commerce. The additional topics introduced, viz.. Investment Analysis, Network Routing problems, and Inventory Control will be able to satisfy students and practicing professionals interested in financial problems, building portfolio in stock market etc