Mary Sumner

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

Good spreadsheets are essential for informing decision making. But most spreadsheets are not good. We help you make better spreadsheets.

Overconfidence is one of the main causes of spreadsheet errors. Being informed about overconfidence leads to more accurate spreadsheets.

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

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

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

Spreadsheets have errors like dogs have fleas. Nine out of every ten spreadsheets suffer some error, and consequences can be severe.

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