Dan Hao

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

Spreadsheets can be considered to be the world's most successful end-user programming language. Spreadsheet formulas are Turing complete.

"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.

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

Your spreadsheets may be disasters in the making. Strive for spreadsheets that are validated, reliable, and auditable.

Do you document your spreadsheets? We use the FizzBuzz word game to illustrate the importance of documenting your spreadsheets.

Overconfidence is one of the main causes of spreadsheet errors. Being informed about overconfidence leads to more accurate spreadsheets.

Our spreadsheet methodology has criteria for designing, building, and validating spreadsheets to ensure that they work correctly.