Seyed Kamrooz Ghazinour Naini

"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.

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

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

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

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

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

Spreadsheets have errors like dogs have fleas. Nine out of every ten spreadsheets suffer some error, and consequences can be severe.

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