1. CERN – IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Data Publishing Tim Smith CERN/IT

2. Easy, in essence…

3. Challenging, in practice Bit Rot Media Verification Media Migration Technology tracking

4. Open Data as a Service REST API REST API OAI- PMH API OAI- PMH API Open Data Pilot

5. Low Barriers

6. Beware the False Summit Data Publication Science

7. Digital Dark Ages Scientific method Propose hypotheses to explain phenomena Test hypotheses predictions through repeatable experiment Share observations and conclusions for independent scrutiny, reproduction and verification Publication: Preparation (standardisation), issuing

8. Accessible Normalisation

9. Interpretable Raw Reconstructed Reduced Published Data Reduction / Analysis SW: 10M LoC

10. Zenodo – GitHub bridge.zenodo.json

11. Code ↔ Data ↔ Paper

12. Interpretable Raw Calibrate Filter Transform Reconstructed Reduced Select Published Anonymised Standardised Annotated Data Reduction / Analysis Calibration data Conditions data Formatters Filter/Selection algorithms Statistical Models

13. Repeatability Capture –Entire workflow –With data, code, statistical models, documentation –Environment, Virtual Machines

14. Verification and Reproduction Good software development practice: –Code test suite Unit & regression Publish data and analysis code together –Workflow and environment captured –Automated test of the result rerunconfirmed

15. http://zenodo.org @zenodo_org Tim.Smith@cern.ch http://www.cern.ch