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      "@value" : "The term crowdsourcing was first proposed by Howe [19] that consists on a problem-solving mechanism in which a task is performed by an “an undefined (and generally large) network of people in the form of an open call.” Nowadays, many different forms of crowdsourcing have emerged, e.g., microtask, contests, macrotask, crowdfunding, among others; each form of crowdsourcing is designed to target particular types of problems and reaching out to different crowds. In the following we briefly describe contest- based and microtask crowdsourcing, the two crowdsourcing methods studied in this work."
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