Richard J. Petti

Spreadsheet audit and review procedures are an essential part of almost all City of London financial transactions.

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

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

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

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

The cascading structure of typical spreadsheet formulae means that just about every spreadsheet is almost certainly wrong.

See our bibliography of spreadsheet best practice, risk management, errors and testing, and methods for improving spreadsheets.

"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.