
Crowdsourcing
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Crowdsourcing is the practice of obtaining needed services, ideas, or content by soliciting contributions from a large group of people, and especially from an online community, rather than from traditional employees or suppliers. Often used to subdivide tedious work or to fund-raise startup companies and charities, this process can occur both online and offline. [ 1 ] The general concept is to combine the efforts of crowds of volunteers or part-time workers, where each one could contribute a small portion, which adds into a relatively large or significant result. Crowdsourcing is different from an ordinary outsourcing since it is a task or problem that is outsourced to an undefined public rather than to a specific, named group.
Crowdsourcing
Today's user interfaces are limited: they only support tasks when we know how to write matching algorithms or interface designs. Microsoft Word is good at laying out your document, but poor at understanding writing and suggesting edits to it. But, it is now feasible to embed on-demand human computation within interactive systems. Crowd workers on services like Amazon Mechanical Turk will do tasks for very small amounts of money.

