Johannes Gartner

Errors in the data, formulas, or manipulation of spreadsheets could be costly, even devastating.

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

"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.

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

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