W. R. Edge

"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.

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

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

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

Once information is loaded into a spreadsheet, it acquires properties that it may not deserve – a process called reification.

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

This article walks you through different methods and built-in tools that can be used to audit and debug Excel spreadsheets.

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