CrowdsourcingQuality Management

and other stories

Panos IpeirotisNew York University & Tagasauris

Amazon Mechanical Turk

patent pending

Tagging

patent pending

But what if MTurk workers submit incorrect tags?

Voting

Voting

But what if MTurk workers also vote incorrectly?

Voting

But what if MTurk workers also vote incorrectly?

Redundancy: 5+ votes per tag

But my task is not just right or wrong…

Creation HIT

(e.g. describe the image)

Improve HIT

(e.g. improve description)

Compare HIT (voting)

Which is better?

Describe this

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 pocketand 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."

New York: Old and Newhttp://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”

1935

2007

1933

2007

1890

2007

1890

1900

1976

2008

The incomplete knowledge graph

[Harsen Homestead, 72nd Street, ca. 1888.]

The incomplete knowledge graph

Harsen Homestead ???

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

The incomplete knowledge graph

Crowd not only annotates historical archives but also

contributes back to the knowledge graph [allowing

easier annotation in the future]

New York Times, 1911

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]