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Creating a slow spreadsheet is easy. Creating an efficient spreadsheet requires more thought and application of specific techniques.

"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.

Your spreadsheets may be disasters in the making. Strive for spreadsheets that are validated, reliable, and auditable.

We are conscious of very few of our errors. When people are confronted with their actual error rates, they are typically shocked.

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

60% of large companies feel 'Spreadsheet Hell' describes their reliance on spreadsheets either completely or fairly well.

Spreadsheet errors are reduced by using good design. Our students do three assignments to acquire good spreadsheet design skills.

The twenty principles for good spreadsheet practice aims to reduce the amount of time wasted and the number of errors.