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"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.

Connexion is a collection of the most useful and interesting spreadsheet-related articles from the web.

Research concludes unanimously that spreadsheet errors are both common and non-trivial. We must seek ways to reduce spreadsheet errors.

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

Your spreadsheets may be disasters in the making. Strive for spreadsheets that are validated, reliable, and auditable.

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

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