Peter Bartholomew

Essential reading

Connexion is a collection of the most useful and interesting spreadsheet-related articles from the web.
"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.
Once information is loaded into a spreadsheet, it acquires properties that it may not deserve – a process called reification.
Only a quarter of survey participants were satisfied with their spreadsheet testing. Their techniques are largely manual and lack formalism.
The cascading structure of typical spreadsheet formulae means that just about every spreadsheet is almost certainly wrong.
Every study that has looked for errors has found them in considerable numbers. Spreadsheeting's childhood is over.
Good spreadsheets are essential for informing decision making. But most spreadsheets are not good. We help you make better spreadsheets.
We are conscious of very few of our errors. When people are confronted with their actual error rates, they are typically shocked.