Danny Dig

Essential reading

Research concludes unanimously that spreadsheet errors are both common and non-trivial. We must seek ways to reduce spreadsheet errors.
See our bibliography of spreadsheet best practice, risk management, errors and testing, and methods for improving spreadsheets.
We are conscious of very few of our errors. When people are confronted with their actual error rates, they are typically shocked.
Spreadsheet errors are reduced by using good design. Our students do three assignments to acquire good spreadsheet design skills.
95% of all spreadsheets contain errors. So, it is almost certain that your spreadsheets are wrong.
A poorly documented spreadsheet erodes effective use. Our workshops help students develop good documentation habits and skills.
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.