Connexion

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Essential reading

See our bibliography of spreadsheet best practice, risk management, errors and testing, and methods for improving spreadsheets.
Connexion is a collection of the most useful and interesting spreadsheet-related articles from the web.
Solver Max provides a collection of optimization model examples in Excel (using the Solver and OpenSolver add-ins) and Python.
"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.
Overconfidence is one of the main causes of spreadsheet errors. Being informed about overconfidence leads to more accurate spreadsheets.
We are conscious of very few of our errors. When people are confronted with their actual error rates, they are typically shocked.
Once information is loaded into a spreadsheet, it acquires properties that it may not deserve – a process called reification.
Your spreadsheets may be disasters in the making. Strive for spreadsheets that are validated, reliable, and auditable.