Debra H. Lu

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

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.

The twenty principles for good spreadsheet practice aims to reduce the amount of time wasted and the number of errors.

"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.

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

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