Michael J. Coblenz

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

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

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

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

Our spreadsheet methodology has criteria for designing, building, and validating spreadsheets to ensure that they work correctly.

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

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