This textbook introduces quantitative methods in operations management based on operational research. Written for undergraduate and graduate students as well as practitioners, this book serves as a valuable compendium of essential tools for project planning, control and strategic decision making. Drawing on the expertise of both senior academics and experienced practitioners, the descriptions of each tool are a harmonious blend of theoretical insight and real-world applicability. With a focus on accessibility, the authors have thoughtfully combined abstract concepts with easy-to-follow examples and detailed case studies. This new second edition features four new chapters and has been fully revised and updated, including new material on topics such as decision theory and Gantt charts.  Readers will benefit from the wealth of well-explained recommendations and practical problem-solving approaches, where the book provides guidance on how to solve the problems presented using commercial software. Whether refining project management, optimising operations, or making strategic decisions, this book equips readers with the knowledge and skills needed to excel in the dynamic field of operations management.