Doing Magic with Trace Precedents
Trace precedent is a basic function. It draws an arrow from one cell to another cell when the first cell appears in the second cell's formula. That means the second cell makes use of the first cell's value.
When enhanced with VBA progamming, trace precedent can do some interesting stuff. For example. it can trace everything in a worksheet and give a different color to separate groups.
A sample result is in the following diagram. This colorful set of precedents and groups can be easily done by users of any level. The details are in this book: Influence charts: How to easily gain a powerful overview of your Excel spreadsheet model
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