"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.
Errors in the data, formulas, or manipulation of spreadsheets could be costly, even devastating.
Research concludes unanimously that spreadsheet errors are both common and non-trivial. We must seek ways to reduce spreadsheet errors.
See our bibliography of spreadsheet best practice, risk management, errors and testing, and methods for improving spreadsheets.
Our spreadsheet methodology has criteria for designing, building, and validating spreadsheets to ensure that they work correctly.
Solver Max provides a collection of optimization model examples in Excel (using the Solver and OpenSolver add-ins) and Python.
A poorly documented spreadsheet erodes effective use. Our workshops help students develop good documentation habits and skills.
95% of all spreadsheets contain errors. So, it is almost certain that your spreadsheets are wrong.
We can help you make better spreadsheets:
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