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An aspect that has remained largely invisible in microtask crowdsourcing is that of work environments; defined as the hardware and software affordances at the disposal of crowd workers which are used to complete microtasks on crowdsourcing platforms. In this paper, we reveal the significant role of work environments in the shaping of crowd work. First, through a pilot study surveying the good and bad experiences workers had with UI elements in crowd work, we revealed the typical issues workers face. Based on these findings, we then deployed over 100 distinct microtasks on CrowdFlower, addressing workers in India and USA in two identical batches. These tasks emulate the good and bad UI element designs that characterize crowdsourcing microtasks. We recorded hardware specifics such as CPU speed and device type, apart from software specifics including the browsers used to complete tasks, operating systems on the device, and other properties that define the work environments of crowd workers. Our findings indicate that crowd workers are embedded in a variety of work environments which influence the quality of work produced. To confirm and validate our data-driven findings we then carried out semi-structured interviews with a sample of Indian and American crowd workers from this platform. Depending on the design of UI elements in microtasks, we found that some work environments support crowd workers more than others. Based on our overall findings resulting from all the three studies, we introduce ModOp, a tool that helps to design crowdsourcing microtasks that are suitable for diverse crowd work environments. We empirically show that the use of ModOp results in reducing the cognitive load of workers, thereby improving their user experience without affecting the accuracy or task completion time.<\/jats:p>","DOI":"10.1145\/3130914","type":"journal-article","created":{"date-parts":[[2017,9,11]],"date-time":"2017-09-11T12:12:26Z","timestamp":1505131946000},"page":"1-29","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":31,"title":["Modus Operandi of Crowd Workers"],"prefix":"10.1145","volume":"1","author":[{"given":"Ujwal","family":"Gadiraju","sequence":"first","affiliation":[{"name":"Leibniz Universit\u00e4t Hannover"}]},{"given":"Alessandro","family":"Checco","sequence":"additional","affiliation":[{"name":"University of Sheffield"}]},{"given":"Neha","family":"Gupta","sequence":"additional","affiliation":[{"name":"University of Nottingham"}]},{"given":"Gianluca","family":"Demartini","sequence":"additional","affiliation":[{"name":"University of Sheffield"}]}],"member":"320","published-online":{"date-parts":[[2017,9,11]]},"reference":[{"key":"e_1_2_1_1_1","first-page":"2016","year":"2016","unstructured":"2016 . 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