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Essential reading

This article walks you through different methods and built-in tools that can be used to audit and debug Excel spreadsheets.
Errors in the data, formulas, or manipulation of spreadsheets could be costly, even devastating.
This early spreadsheet, a Babylonian clay tablet c.1800 BC, contains several errors. How many errors do your spreadsheets have?
"Oh My God" my formulas are not working! This article covers most of the reasons for Excel formulas not working. And how to fix them.
Incorrect use of Excel's NPV function is a common source of spreadsheet errors. We show several pitfalls and ways to avoid them.
Creating a slow spreadsheet is easy. Creating an efficient spreadsheet requires more thought and application of specific techniques.
See our bibliography of spreadsheet best practice, risk management, errors and testing, and methods for improving spreadsheets.
95% of all spreadsheets contain errors. So, it is almost certain that your spreadsheets are wrong.