Jan-Peter Ostberg

A poorly documented spreadsheet erodes effective use. Our workshops help students develop good documentation habits and skills.

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

"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.

Incorrect use of Excel's NPV function is a common source of spreadsheet errors. We show several pitfalls and ways to avoid them.

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

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

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