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Testing and Refactoring Spreadsheets - Felienne Hermans at Eusprig 2014
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Testing and Refactoring Spreadsheets - Felienne Hermans at Eusprig 2014

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  • 1. Testing and Refactoring Spreadsheets Felienne Hermans Delft University of Technology
  • 2. Felienne Hermans Delft University of Technology Testing and Refactoring Spreadsheets
  • 3. 95% of all U.S. firms use spreadsheets for financial reporting
  • 4. 90% of all analysts in industry perform calculations in spreadsheets
  • 5. Importance can grow over time
  • 6. And, spreadsheet exist ‘under the radar’
  • 7. Only 33% of spreadsheets has a manual
  • 8. Complex spreadsheets without documentation can lead to serious errors
  • 9. The European Spreadsheet Risk Interest Group (Eusprig.org) collects horror stories
  • 10. Why?
  • 11. No documentation, errors, long life It looks like…?
  • 12. No documentation, errors, long life It looks like software!
  • 13. For software, tools have been created to help programmers write good code
  • 14. We bring quality tools to spreadsheets
  • 15. BumbleBee: A tool for spreadsheet improvement
  • 16. But, not all transformations have to be behavior preserving
  • 17. You can download BumbleBee from my website (felienne.com)
  • 18. The transformations are entirely programmable, with a small language
  • 19. Expector: A tool for spreadsheet testing
  • 20. These test formulas can be exploited
  • 21. Our tool Expector can find test formulas
  • 22. Expector helps users to understand robustness of their spreadsheets
  • 23. More info? Over drinks, send me an email (f.f.j.hermans@tudelft.nl) or visit felienne.com

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