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Testing and Refactoring Spreadsheets Felienne Hermans Delft University of Technology
Testing and Refactoring
Spreadsheets
Felienne HermansDelft University of Technology
Felienne HermansDelft University of Technology
(@felienne)
Testing and Refactoring
Spreadsheets
95% of all U.S. firms use spreadsheets for financial reporting
90% of all analysts in industry perform calculations in spreadsheets
Importance can grow over time
And, spreadsheet exist‘under the radar’
Only 33% of spreadsheets has a manual
Complex spreadsheets without documentation can lead to serious errors
The European Spreadsheet Risk Interest Group (Eusprig.org) collects horror stories
Why?
No documentation, errors, long lifeIt looks like…?
No documentation, errors, long lifeIt looks like software!
For software, tools have been created to
help programmers write good code
We bring quality tools to spreadsheets
BumbleBee: A tool for spreadsheet
improvement
But, not all transformations have to be
behavior preserving
You can download BumbleBee frommy website (felienne.com)
The transformations are entirely programmable, with a small language
Expector: A tool for spreadsheet testing
These test formulas can be exploited
Our tool Expector can find test formulas
Expector helps users to understand robustness of their spreadsheets
More info? Over drinks, send me an email ([email protected]) or visit felienne.com
