Jong-Myung Choi

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

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

Research concludes unanimously that spreadsheet errors are both common and non-trivial. We must seek ways to reduce spreadsheet errors.

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

"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.

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

Every study that has looked for errors has found them in considerable numbers. Spreadsheeting's childhood is over.

The cascading structure of typical spreadsheet formulae means that just about every spreadsheet is almost certainly wrong.