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95% of all spreadsheets contain errors. So, it is almost certain that your spreadsheets are wrong.

Errors in the data, formulas, or manipulation of spreadsheets could be costly, even devastating.

See our bibliography of spreadsheet best practice, risk management, errors and testing, and methods for improving spreadsheets.

Only a quarter of survey participants were satisfied with their spreadsheet testing. Their techniques are largely manual and lack formalism.

Good spreadsheets are essential for informing decision making. But most spreadsheets are not good. We help you make better spreadsheets.

"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.

We are conscious of very few of our errors. When people are confronted with their actual error rates, they are typically shocked.

Creating a slow spreadsheet is easy. Creating an efficient spreadsheet requires more thought and application of specific techniques.