Alan S. Horowitz

Do you document your spreadsheets? We use the FizzBuzz word game to illustrate the importance of documenting your spreadsheets.

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

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

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

"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.

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

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

Creating a slow spreadsheet is easy. Creating an efficient spreadsheet requires more thought and application of specific techniques.