SACHS

Essential reading

Spreadsheets have errors like dogs have fleas. Nine out of every ten spreadsheets suffer some error, and consequences can be severe.
This early spreadsheet, a Babylonian clay tablet c.1800 BC, contains several errors. How many errors do your spreadsheets have?
"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.
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.
Research concludes unanimously that spreadsheet errors are both common and non-trivial. We must seek ways to reduce spreadsheet errors.
Overconfidence is one of the main causes of spreadsheet errors. Being informed about overconfidence leads to more accurate spreadsheets.
Once information is loaded into a spreadsheet, it acquires properties that it may not deserve – a process called reification.