Joan Ko

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

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

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.

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

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.

Incorrect use of Excel's NPV function is a common source of spreadsheet errors. We show several pitfalls and ways to avoid them.