The new edition of this best-selling quantitative methods textbook maintains the accessible and user-friendly style used in earlier editions. This text remains a first-rate introduction to the effective use of mathematical and statistical techniques in business operations. It works from first principles and builds towards a complete understanding of quantitative methods as required on first level undergraduate, graduate and professional courses. The new edition includes a new chapter on quality control and more worked examples in each chapter. References are made to Excel and Lotus 1-2-3 and business-scenario questions have been added to the end of each chapter.