I replaced my error-checking spreadsheets with Excel data validation and caught mistakes before they happened
I used to set aside time every week to clean my spreadsheets by running helper formulas, scanning for red cells from conditional formatting, and fixing typos that had snuck in over the past few days. The cleanup never got shorter, so I gave Excel's Data Validation dialog a closer look. Instead of finding mistakes after they'd already poisoned my pivot tables, I now block them the moment someone tries to enter an invalid value.
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