The third edition of "Quantitative Methods for Business Decisions" has been updated to reflect the changing approach to quantitative information. The ability to use computer based methods and the ability to present the outcome of computer based analysis are seen as increasingly important. The coverage of matrices has been extended to form a new chapter, and the construction of decision trees, non-parametric statistical tests and modelling of queues added to existing chapters. There is a new chapter on simulation to reflect the business importance of this modelling technique. The book is recommended reading for a wide range of courses, including BTEC programmes, degree courses and MBA courses. The book has been designed to give a step-by-step development of the use of mathematics and statistics. The final part of the book has been extended to include a diagnostic mathematics test and two typical in-course assignments.