Tina M. Loraas

"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.

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

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

This early spreadsheet, a Babylonian clay tablet c.1800 BC, contains several errors. How many errors do your spreadsheets have?

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

Spreadsheet errors are reduced by using good design. Our students do three assignments to acquire good spreadsheet design skills.

Spreadsheet audit and review procedures are an essential part of almost all City of London financial transactions.