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We conduct an experimental analysis of a dataset comprising over 27 millionmicrotasks performed by over 70,000 workers issued to a large crowdsourcingmarketplace between 2012-2016. Using this data---never before analyzed in anacademic context---we shed light on three crucial aspects of crowdsourcing: (1)Task design --- helping requesters understand what constitutes an effectivetask, and how to go about designing one; (2) Marketplace dynamics --- helpingmarketplace administrators and designers understand the interaction betweentasks and workers, and the corresponding marketplace load; and (3) Workerbehavior --- understanding worker attention spans, lifetimes, and generalbehavior, for the improvement of the crowdsourcing ecosystem as a whole.

Understanding Workers, Developing Effective Tasks, and Enhancing Marketplace Dynamics: A Study of a Large Crowdsourcing Marketplace