1. Spreadsheet Errors Designing Financial Models That Work Dmitry Stechny

3. Coopers and Lybrand in England found that 90% of all spreadsheets with more than 150 rows contained errors.

5. Mechanical errors – typically data entry typos and wrong cell references

8. Set procedures for data entry

9. Always ballpark number to check for obvious mistakes

10. Double-check your spreadsheet. Have others check your work.