Abstract
Human computation systems, which draw upon human competencies in order to solve hard computational problems, represent a growing interest within HCI. Despite the numerous technical demonstrations of human computation systems, however, there are few design guidelines or frameworks for researchers or practitioners to draw upon when constructing such a system. Based upon findings from our own human computation system, and drawing upon those published within HCI, and from other scientific and engineering literatures, as well as systems deployed commercially, we offer a framework of five challenging issues of relevance to designers of systems with human computation elements: designing the motivation of participants in the human computation system and sustaining their engagement; orienting participants, framing and orienting participants; using situatedness as a driver for content generation; considering the organisation of human and machine roles in human computation systems; and reconsidering the way in which computational analogies are applied to the design space of human computation.
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