Alan Blackwell

This article walks you through different methods and built-in tools that can be used to audit and debug Excel spreadsheets.

"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.

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

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

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

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

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

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