Advances in computer technology have driven much of the recent progress in operations research. This has given OR more visibility at the upper levels of management and has created a new component of the software industry dedicated to the implementation of OR techniques. On the CD-ROM accompanying this book, we provide computational support for each chapter with a collection of Microsoft Excel add-ins. Each is programmed in Visual Basic of Applications (VBA), the Microsoft macro language for the office suite of programs, and works with both the Windows and Macintosh operating systems.