Designed to provide a sound understanding of quantitative techniques, this manual is suitable for students on ICSA, ACCA, CIMA, CIPFA and BTEC higher level courses. It includes many exercises and examination questions both with and without answers. This edition has been revised and updated. Extensions of coverage include: statistical process control, multiplicative and additive time series models, decision models. It gives full coverage of the latest professional syllabuses including the new ACCA decision making techniques paper. In addition, questions have benn included from the most recent professional examinations. The free lecturer's supplement now includes OHP masters of key diagrams from the text.