Rui Pereira

Essential reading

Do you document your spreadsheets? We use the FizzBuzz word game to illustrate the importance of documenting your spreadsheets.
We are conscious of very few of our errors. When people are confronted with their actual error rates, they are typically shocked.
"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.
Good spreadsheets are essential for informing decision making. But most spreadsheets are not good. We help you make better spreadsheets.
The cascading structure of typical spreadsheet formulae means that just about every spreadsheet is almost certainly wrong.
95% of all spreadsheets contain errors. So, it is almost certain that your spreadsheets are wrong.
Every study that has looked for errors has found them in considerable numbers. Spreadsheeting's childhood is over.