1. Crowdsourcing Quality Management and other stories Panos Ipeirotis New York University & Tagasauris

2. Amazon Mechanical Turk

3. patent pending Tagging

4. patent pending But what if MTurk workers submit incorrect tags?

5. Voting

6. But what if MTurk workers also vote incorrectly?

7. Voting But what if MTurk workers also vote incorrectly? Redundancy: 5+ votes per tag

8. But my task is not just right or wrong… Creation HIT (e.g. describe the image) Improve HIT (e.g. improve description) Improve HIT (e.g. improve description) Compare HIT (voting) Which is better? Compare HIT (voting) Which is better? Describe this

9. version 1: A parial view of a pocket calculator together with some coins and a pen. version 2: A view of personal items a calculator, and some gold and copper coins, and a round tip pen, these are all pocket and wallet sized item used for business, writting, calculating prices or solving math problems and purchasing items. version 3: A close-up photograph of the following items: A CASIO multi- function calculator. A ball point pen, uncapped. Various coins, apparently European, both copper and gold. Seems to be a theme illustration for a brochure or document cover treating finance, probably personal finance. version 4: …Various British coins; two of £1 value, three of 20p value and one of 1p value. … version 8: “A close-up photograph of the following items: A CASIO multi-function, solar powered scientific calculator. A blue ball point pen with a blue rubber grip and the tip extended. Six British coins; two of £1 value, three of 20p value and one of 1p value. Seems to be a theme illustration for a brochure or document cover treating finance - probably personal finance."

10. New York: Old and New http://newyorkoldandnew.blogspot.com/ An engagement experiment: “Search the NYPL digital library for an old photo of New York, and then find a photo of the same location, today”

11. 1935

12. 2007

13. 1933

14. 2007

15. 1890

16. 2007

17. 1890

18. 1900

19. 1976

20. 2008

21. The incomplete knowledge graph [Harsen Homestead, 72nd Street, ca. 1888.]

22. The incomplete knowledge graph Harsen Homestead ???

23. The incomplete knowledge graph Jacob Harsen, a farmer who started Harsenville, a village spanning 68th Street to 81st Street between Central Park West and the Hudson River. Source: http://www.oneshermansquare.com/HistoryofShermanSquare.aspx

24. The incomplete knowledge graph Crowd not only annotates historical archives but also contributes back to the knowledge graph [allowing easier annotation in the future]

25. New York Times, 1911

26. The incomplete knowledge graph Crowd participation not only annotates historical archives but also contributes back to the knowledge graph [allowing easier annotation in the future]