Formulas and functions provide the logic that powers spreadsheets. Managing programming logic is always a challenge, but keeping track of programming logic across multiple cells , sheets, and workbooks can be particularly difficult, especially as spreadsheets grow and are reused. What's more, the formula and function capabilities built into Excel might not always be what you want, further complicating the situation. Fortunately, there are a lot of ways you can keep your formulas and functions sane.
