Spreadsheet programs began as a better way to store, present, and interpret information that previously had been kept on paper and calculated by hand, probably using a 10-key calculator. Often the first worksheets we created when we were climbing the old Excel learning curve were little more than clean, two-dimensional reproductions of what we used to do on paper. One way to step up from the old paper paradigm is to use modular design. Modular design is a sort of “structured programming” or “object-oriented” approach, where you carve your data into logical chunks that make sense as stand-alone elements. (The other design approach is called hierarchical, where you organize your data for error identification and maximum readability.) Because there’s usually no need to keep detail data in any kind of presentable format, why bother? Concentrate your worksheet beautification program on the summary sheets and charts you need to share with others. Design a system of worksheets instead of trying to get everything on a single worksheet. Figure 5-6 shows a rudimentary example of modular design—that is, one worksheet contains data, and another worksheet contains a specific type of analysis. In a complex modular system, you might have dozens of worksheets, each dedicated to a specific task.