New article characterizing crowdsourcing on the web

There is an article in the new issue of CACM on “Crowdsourcing systems on the World-Wide Web”, by Anhai Doan, Raghu Ramakrishnan, and Alon Y. Halevy. In it they offer a definition of crowdsourcing systems, characterize them along nine dimensions, and discuss some of the dimensions as challenges.
It’s a useful review article, with many examples and a good bibliography. The characterization in nine dimensions is clear and I think mostly useful.
I’m particularly pleased to see that they have given prominent attention to the incentive-centered design issues on which I (and this blog) have focused for years. Indeed, they define crowdsourcing systems in terms of four incentive problems that must be solved (distinguishing them from, say, crowd management systems that only address three of the questions). They define crowdsourcing as “A system that enlists humans to help solve a problem defined by the system owners, if in doing so it addresses four fundamental challenges:

  • How to recruit and retain users?
  • What contributions can users make?
  • How to combine user contributions to solve the target problems?
  • How to evaluate users and their contributions?

The first and second are the “getting stuff in” (contribution) problem about which I write. How to get people to make effort to contribute something to the good of others? The fourth is the quality incentive problem, which I usually separate into “getting good stuff in” (positive quality), and “keeping bad stuff out”.

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