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

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

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.

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

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

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

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