Each spreadsheet exercise provides a list of objectives, background material, and annotated step by step instructions (Windows and Macintosh) for creating a model on a given topic. Students then examine how various parameters affect model outcomes and, through a set of guided questions, are challenged to develop their model further. In the process, they become proficient with many of the functions available on most spreadsheet programs and learn to write and develop their own macros. This title can be used independently as the basis of a laboratory course, or can supplement a variety of texts. System requirements are Microsoft Excel or other spreadsheet program.