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ItemUnderstanding the social navigation user experience(Georgia Institute of Technology, 2009-07-06) Goecks, JeremyA social navigation system collects data from its users--its community--about what they are doing, their opinions, and their decisions, aggregates this data, and provides the aggregated data--community data--back to individuals so that they can use it to guide behavior and decisions. In this thesis, I document my investigation of the user experience for social navigation systems that employ activity data. I make three contributions in this thesis. First, I synthesize social navigation systems research with research in social influence, advice-taking, and informational cascades to construct hypotheses about the social navigation user experience. These hypotheses posit that community data from a social navigation system exerts informational influence on users, that users egocentrically discount community data, that herding in social navigation systems can be characterized as informational cascades, and that the size and unanimity of the community data correspond to the strength of the community data's influence. The second contribution of this thesis is an experiment that evaluates the hypotheses about the social navigation user experience; this experiment investigated how a social navigation system can support online charitable giving decisions. The experiment's results support the majority of the hypotheses about the social navigation user experience and provide mixed evidence for the other hypotheses. The implications that arise from the experiment's findings compromise the final contribution of this thesis. These implications concern improving the design of social navigation systems and developing a general framework for evaluating the social influence of social navigation systems.
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ItemDesigning ubiquitous computing for reflection and learning in diabetes management(Georgia Institute of Technology, 2009-04-09) Mamykina, LenaThis dissertation proposes principles for the design of ubiquitous health monitoring applications that support reflection and learning in context of diabetes management. Due to the high individual differences between diabetes cases, each affected individual must find the optimal combination of lifestyle alterations and medication through reflective analysis of personal diseases history. This dissertation advocates using technology to enable individuals' proactive engagement in monitoring of their health. In particular, it proposes promoting individuals' engagement in reflection by exploiting breakdowns in individuals' routines or understanding; supporting continuity in thinking that leads to a systematic refinement of ideas; and supporting articulation of thoughts and understanding that helps to transform insights into knowledge. The empirical evidence for these principles was gathered thought the deployment studies of three ubiquitous computing applications that help individuals with diabetes in management of their diseases. These deployment studies demonstrated that technology for reflection helps individuals achieve their personal disease management goals, such as diet goals. In addition, they showed that using technology helps individuals embrace a proactive attitude towards their health indicated by their adoption of the internal locus of control.
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ItemExploring a Technological Hermeneutic: Understanding the Interpretation of Computer-Mediated Messaging Systems(Georgia Institute of Technology, 2008-05-19) Voida, AmyEmpirical evidence suggests that individuals can hold different interpretations of a technology. In this research, I explore the question of where these different interpretations come from. What influences an individual s interpretation of a technology? And what is the nature of these interpretations? I explore these questions through studies of computer-mediated messaging systems, including instant messaging, photo-enhanced instant messaging, multimedia messaging (cameraphones), and mobile messaging (BlackBerries). In this research, I draw from philosophical hermeneutics, a domain of study examining the nature of interpretation, and present a technological hermeneutic, a descriptive theory of how individuals interpret technology how they come to understand the meaning of the technology in their own lives. This theory offers insight into the myriad resources individuals draw from when constructing an interpretation of technology, including their own experiences with related technologies as well as their interactions with others use and understanding of the technology. This theory also offers insight into the nature of the interpretive process. Interpretations are dynamic and evolving; individuals continually draw from new experiences, reengaging and reinterpreting technology. Interpretations are also hybrid and synthesized; individuals draw from multiple resources in an active process of interpretive bricolage.
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ItemExploring user interface challenges in supporting activity-based knowledge work practices(Georgia Institute of Technology, 2008-05-19) Voida, StephenThe venerable desktop metaphor is beginning to show signs of strain in supporting modern knowledge work. Traditional desktop systems were not designed to support the sheer number of simultaneous windows, information resources, and collaborative contexts that have become commonplace in contemporary knowledge work. Even though the desktop has been slow to evolve, knowledge workers still consistently manage multiple tasks, collaborate effectively among colleagues or clients, and manipulate information most relevant to their current task by leveraging the spatial organization of their work area. The potential exists for desktop workspaces to better support these knowledge work practices by leveraging the unifying construct of activity. Semantically-meaningful activities, conceptualized as a collection of tools (applications, documents, and other resources) within a social and organizational context, offer an alternative orientation for the desktop experience that more closely corresponds to knowledge workers' objectives and goals. In this research, I unpack some of the foundational assumptions of desktop interface design and propose an activity-centered model for organizing the desktop interface based on empirical observations of real-world knowledge work practice, theoretical understandings of cognition and activity, and my own experiences in developing two prototype systems for extending the desktop to support knowledge work. I formalize this analysis in a series of key challenges for the research and development of activity-based systems. In response to these challenges, I present the design and implementation of a third research prototype, the Giornata system, that emphasizes activity as a primary organizing principle in GUI-based interaction, information organization, and collaboration. I conclude with two evaluations of the system. First, I present findings from a longitudinal deployment of the system among a small group of representative knowledge workers; this deployment constitutes one of the first studies of how activity-based systems are adopted and appropriated in a real-world context. Second, I provide an assessment of the technologies that enable and those that pose barriers to the development of activity-based computing systems.