Kevin Chang

We are conscious of very few of our errors. When people are confronted with their actual error rates, they are typically shocked.

"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.

Spreadsheets can be considered to be the world's most successful end-user programming language. Spreadsheet formulas are Turing complete.

This article walks you through different methods and built-in tools that can be used to audit and debug Excel spreadsheets.

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

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

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

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