1. ERRORS and SPREADSHEETS An Often Overlooked Problem that Every Excel User Knows Well Federico Fabbri DFMW

2. Why We Make Errors We Are Pressed For Time.. ..Overconfident.. ..and Often Without Formal Training

4. We Miss Critical Information

5. We Don’t Use the Data in the Proper Way

6. We Use the Wrong Data

7. We Use a Wrong Function

8. We Use Functions that We Don’t Fully Understand

9. We Mistype Numbers

10. We Point to the Wrong Cell

13. We Don’t Question the Reliability of the Source

14. We Don’t Use Multiple Sources

15. We Use Biased Samples

16. We Use Unreliable Information Systems

18. We Make It too Difficult for Ourselves and Other People to Check for Mistakes LAYOUT

19. What Are the Consequences ERRORS IN SPREADSHEETS WRONG ANALYSES POOR DECISIONS BAD RESULTS

20. What We Can Do 1 KEEP YOUR SPREEDSHEETS SIMPLE AND CLEAR! 2 CHECK YOUR ASSUMPTIONS! 3 ASK FOR HELP! 4 DOUBLE CHECK! 5 ASK SOMEBODY ELSE TO CHECK!