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Ofer Arazy


Publications by Ofer Arazy (bibliography)

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Nov, Oded, Arazy, Ofer and Anderson, David (2011): Dusting for science: motivation and participation of digital citizen science volunteers. In: Proceedings of the 2011 iConference 2011. pp. 68-74. http://dx.doi.org/10.1145/1940761.1940771

Digital citizen science offers a low-cost way to strengthen the scientific infrastructure, and engage members of the public in science. It is based on two pillars: (1) a technological pillar, which involves developing computer systems to manage large amounts of distributed resources, and (2) a motivational pillar, which involves attracting and retaining volunteers who would contribute their skills, time, and effort to a scientific cause. While the technological dimension has been widely studied, the motivational dimension received little attention to date. To address this gap, we surveyed volunteers at Stardust@home a digital citizen science project, in which volunteers classify online images from NASA's Stardust spacecraft. We found that collective and intrinsic motivations are the most salient motivational factors, whereas reward motives seem to be less relevant. We also found that intrinsic and norm-oriented motives are most strongly associated with participation intentions, which were, in turn, found to be associated with participation effort. Implications for research and practice are discussed.

© All rights reserved Nov et al. and/or ACM Press

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Arazy, Ofer and Nov, Oded (2010): Determinants of wikipedia quality: the roles of global and local contribution inequality. In: Proceedings of ACM CSCW10 Conference on Computer-Supported Cooperative Work 2010. pp. 233-236. http://doi.acm.org/10.1145/1718918.1718963

The success of Wikipedia and the relative high quality of its articles seem to contradict conventional wisdom. Recent studies have begun shedding light on the processes contributing to Wikipedia's success, highlighting the role of coordination and contribution inequality. In this study, we expand on these works in two ways. First, we make a distinction between global (Wikipedia-wide) and local (article-specific) inequality and investigate both constructs. Second, we explore both direct and indirect effects of these inequalities, exposing the intricate relationships between global inequality, local inequality, coordination, and article quality. We tested our hypotheses on a sample of a Wikipedia articles using structural equation modeling and found that global inequality exerts significant positive impact on article quality, while the effect of local inequality is indirect and is mediated by coordination.

© All rights reserved Arazy and Nov and/or their publisher

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Nov, Oded, Anderson, David and Arazy, Ofer (2010): Volunteer computing: a model of the factors determining contribution to community-based scientific research. In: Proceedings of the 2010 International Conference on the World Wide Web 2010. pp. 741-750. http://doi.acm.org/10.1145/1772690.1772766

Volunteer computing is a powerful way to harness distributed resources to perform large-scale tasks, similarly to other types of community-based initiatives. Volunteer computing is based on two pillars: the first is computational -- allocating and managing large computing tasks; the second is participative -- making large numbers of individuals volunteer their computer resources to a project. While the computational aspects of volunteer computing received much research attention, the participative aspect remains largely unexplored. In this study we aim to address this gap: by drawing on social psychology and online communities research, we develop and test a three-dimensional model of the factors determining volunteer computing users' contribution. We investigate one of the largest volunteer computing projects -- SETI@home -- by linking survey data about contributors' motivations to their activity logs. Our findings highlight the differences between volunteer computing and other forms of community-based projects, and reveal the intricate relationship between individual motivations, social affiliation, tenure in the project, and resource contribution. Implications for research and practice are discussed.

© All rights reserved Nov et al. and/or their publisher

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