Jennifer M. Mueller

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

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

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

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

The twenty principles for good spreadsheet practice aims to reduce the amount of time wasted and the number of errors.

"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.

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

A poorly documented spreadsheet erodes effective use. Our workshops help students develop good documentation habits and skills.