Quality Control on Crowdsourcing sites

What kind of quality control mechanisms do crowdsourcing sites have? A new study analyzes this. The big finding:

“Finally, while only half of the sites surveyed offer some form of quality control of work undertaken, only a very small number offers two or more such mechanisms.”
The study looked at five types of quality control mechanism: Screen Shot 2016-05-01 at 9.37.21 AM
And found that about 50% have qr1, 20% have qr2, 16% have qr3, 9% have qr4 and 17% have qr5.
Citation: Mourelatos, E., Tzagarakis, M., & Dimara, E. (2016). A Review of Online Crowdsourcing Platforms. South-Eastern Europe Journal of Economics, 14(1), 59-73.

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