Kevin Lubicky

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

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

"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.

Solver Max provides a collection of optimization model examples in Excel (using the Solver and OpenSolver add-ins) and Python.

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

Only a quarter of survey participants were satisfied with their spreadsheet testing. Their techniques are largely manual and lack formalism.

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