Classroom BRIDGE supports activity awareness by facilitating planning and goal revision in collaborative, project-based middle school science. It integrates large-screen and desktop views of project times to support i...
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ISBN:
(纸本)9781581136364
Classroom BRIDGE supports activity awareness by facilitating planning and goal revision in collaborative, project-based middle school science. It integrates large-screen and desktop views of project times to support incidental creation of awareness information through routine document transactions, integrated presentation of awareness information as part of workspace views, and public access to subgroup activity. It demonstrates and develops an object replication approach to integrating synchronous and asynchronous distributed work for a platform incorporating both desktop and large-screen devices. This paper describes an implementation of these concepts with preliminary evaluation data, using timeline-based user interfaces.
With recent troubles in U.S. elections, there has been a nationwide push to update voting systems. Municipalities are investing heavily in electronic voting systems, many of which use a touch screen. These systems off...
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ISBN:
(纸本)9781581136302
With recent troubles in U.S. elections, there has been a nationwide push to update voting systems. Municipalities are investing heavily in electronic voting systems, many of which use a touch screen. These systems offer the promise of faster and more accurate voting, but the current reality is that they are fraught with usability and systemic problems. This paper surveys issues relating to usability of electronic voting systems and reports on a series of studies, including one with 415 voters using new systems that the State of Maryland purchased. Our analysis shows these systems work well, but have several problems, and many voters have concerns about them.
Dynamic queries facilitate rapid exploration of information by real-time visual display of both query formulation and results. Dynamic query sliders are linked to the main visualization to filter data. A common altern...
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Dynamic queries facilitate rapid exploration of information by real-time visual display of both query formulation and results. Dynamic query sliders are linked to the main visualization to filter data. A common alternative to dynamic queries is to link several simple visualizations, such as histograms, to the main visualization with a brushing interaction strategy. Selecting data in the histograms highlights that data in the main visualization. We compare these two approaches in an empirical experiment on DataMaps, a geographic data visualization tool. Dynamic query sliders resulted in better performance for simple range tasks, while brushing histograms was better for complex trend evaluation and attribute relation tasks. Participants preferred brushing histograms for understanding relationships between attributes and the rich information they provided.
The experience of preparing interface design knowledge to be reusable allows reflection on the process, potential and general challenges of effectively and efficiently using this knowledge in design tasks. With an int...
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The experience of preparing interface design knowledge to be reusable allows reflection on the process, potential and general challenges of effectively and efficiently using this knowledge in design tasks. With an interest in crafting a catalog for design claims that would implement recent reuse theory in the human-computerinteraction field, we developed and implemented a unique process of creating reusable content for notification systems - interfaces used for multitasking. This process, which we describe and illustrate, extends previous work on capturing metadata related to design claims. The data and metadata are stored in the catalog, which is intended to be accessible to other designers for reuse in other domains. The multitask nature of our catalog subject matter highlights a major challenges faced in reuse: the generalization specific and contextual information (claims). The challenge of balancing abstraction with specificity to ensure both meaningful and domain-independent data is also addressed. We believe that our approach can generalize to other reuse projects that strive for cross-domain knowledge application.
This panel brings together usability and voting experts to discuss voting user experience in American governmental elections. Technological improvements and voting debacles have made this a special time for improving ...
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ISBN:
(纸本)1581136374
This panel brings together usability and voting experts to discuss voting user experience in American governmental elections. Technological improvements and voting debacles have made this a special time for improving voting user experience. Can technologists improve the confidence citizens have in the voting system? What are the roles of teaching materials, registration processes, ballot design, polling place practices, equipment manufacturer relationships, and other humancomputerinteraction processes in elections? Voting officials and politicians are eager for improvements in voting. This panel includes speakers from government and the CHI community to present legislative perspective, usability evaluation approach, administrators' view and behavioral science's suggestions for voting interface evaluation, design and deployment.
The Informedia Digital Video Library user interface summarizes query results with a collage of representative keyframes. We present a user study in which keyframe occlusion caused difficulties. To use the screen space...
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The Informedia Digital Video Library user interface summarizes query results with a collage of representative keyframes. We present a user study in which keyframe occlusion caused difficulties. To use the screen space most efficiently to display images, both occlusion and wasted whitespace should be minimized. Thus optimal choices will tend toward constant density displays. However, previous constant density algorithms are based on global density, which leads to occlusion and empty space if the density is not uniform. We introduce an algorithm that considers the layout of individual objects and avoids occlusion altogether. Efficiency concerns are important for dynamic summaries of the Informedia Digital Video Library, which has hundreds of thousands of shots. Posting multiple queries that take into account parameters of the visualization as well as the original query reduces the amount of work required. This greedy algorithm is then compared to an optimal one. The approach is also applicable to visualizations containing complex graphical objects other than images, such as text, icons, or trees.
A software agent is being built to help naive users effectively perform the search tasks without feeling intimidated or overwhelmed by the technology or the tool. The display of information as well as the content of i...
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A software agent is being built to help naive users effectively perform the search tasks without feeling intimidated or overwhelmed by the technology or the tool. The display of information as well as the content of it can either be too much (the problem of precision) or too little (the recall problem) which in turn can leave a naive user feel frustrated with the search. This agent's aim is to assist these users with their search goals. The overall strategy is to understand the search goal and then "push" and "pull" information to match the needs.
This study examines the effect of individual differences on the program comprehension strategies of users working with an unfamiliar programming system. Participants of varying programming expertise were given a batte...
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This study examines the effect of individual differences on the program comprehension strategies of users working with an unfamiliar programming system. Participants of varying programming expertise were given a battery of psychological tests, a brief introduction to a statistical programming environment, and a 20-minute debugging task. Our data show three distinct comprehension strategies that were related to programming experience, but individuals with stronger domain knowledge for specific bugs tended to succeed.
Search agents can improve users' perceptions of how effective and efficient database retrieval is. In connection with an on-going project for community interaction, a search agent was designed with a strong theore...
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Search agents can improve users' perceptions of how effective and efficient database retrieval is. In connection with an on-going project for community interaction, a search agent was designed with a strong theoretical basis and tested for effectiveness with the community of users.
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