Virtually all of the examples and exercises in this text were solved with the Excel add-ins. Nevertheless, there are limitations on the size of problems that they can handle, so it would be naïve to think every real-world problem can be solved with this type of soft-ware. Spreadsheets have their advantages and conveniences but are not a substitute for creativity and special-purpose codes. Many optimization problems found in scheduling and logistics, for example, will quickly eat up the resources of any spreadsheet software package. In such cases, advanced or custom-tailored technique, such as decomposition, are likely