Number of co-authors:10
Number of publications with 3 favourite co-authors:Ben Shneiderman:4Staffan Truve:2Christopher Williamson:2
Christopher Ahlberg's 3 most productive colleagues in number of publications:Ben Shneiderman:225Catherine Plaisant:78Lars Erik Holmquis..:49
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Publications by Christopher Ahlberg (bibliography)
Holmquist, Lars Erik and Ahlberg, Christopher (1997): Flip Zooming: A Practical Focus+Context Approach to Visualizing Large Data Sets. In: Smith, Michael J., Salvendy, Gavriel and Koubek, Richard J. (eds.) HCI International 1997 - Proceedings of the Seventh International Conference on Human-Computer Interaction - Volume 2 August 24-29, 1997, San Francisco, California, USA. pp. 763-766.
Hascoet-Zizi, Mountaz, Plaisant, Catherine, Ahlberg, Christopher, Chalmers, Matthew, Korfhage, Robert R. and Rao, Ramana (1996): Where is Information Visualization Technology Going?. In: Kurlander, David, Brown, Marc and Rao, Ramana (eds.) Proceedings of the 9th annual ACM symposium on User interface software and technology November 06 - 08, 1996, Seattle, Washington, United States. pp. 75-77.
Over the past few years a lot of different information visualization techniques have been proposed. Being a relatively new and large field, the spectrum of emerging techniques has not clearly been identified. Another major consequence of the youthfulness of the field is that very few evaluation have been conducted so far. The aim of the panel will be to address these two points. First, panelist will characterize the spectrum of information visualization technology depending on tasks, users or data. Panelists will further discuss future trends in visualization technology by determining which are the most important features or challenges that information visualization systems should address. Second, the discussion will focus on how these systems are to be evaluated: through controlled experiments, system evaluation, long-time studies, verbal protocols, theoretical evaluations, or else?
© All rights reserved Hascoet-Zizi et al. and/or ACM Press
Ahlberg, Christopher and Truve, Staffan (1996): Exploring terra incognita in the design space of query devices. In: Bass, Leonard J. and Unger, Claus (eds.) Engineering for Human-Computer Interaction, Proceedings of the IFIP TC2/WG2.7 Working Conference on Engineering for Human-Computer Interaction August, 1996, Yellowstone Park, USA. pp. 49-68.
Ahlberg, Christopher (1996): Cocktailmaps: a space-filling visualization method for complex communicating systems. In: Catarci, Tiziana, Costabile, Maria Francesca, Levialdi, Stefano and Santucci, Giuseppe (eds.) AVI 1996 - Proceedings of the workshop on Advanced visual interfaces May 27-29, 1996, Gubbio, Italy. pp. 175-183.
Ahlberg, Christopher and Truve, Staffan (1995): Tight Coupling: Guiding User Actions in a Direct Manipulation Retrieval System. In: Kirby, M. A. R., Dix, Alan J. and Finlay, Janet E. (eds.) Proceedings of the Tenth Conference of the British Computer Society Human Computer Interaction Specialist Group - People and Computers X August, 1995, Huddersfield, UK. pp. 305-321.
Tight coupling is a strategy in the design of query mechanisms in direct manipulation query systems. Tight coupling helps users navigate toward high precision queries in a space of database queries, avoid empty query results, and quickly narrow down the number of possible and meaningful queries. Tight coupling of a query mechanism is defined as: the results of user operations (querying, zooming, panning) on query devices (starfields, rangesliders, alphasliders, and toggles) are reflected in all query devices by visual feedback and physical constraints on meaningful query settings. An intuitive design of tight coupling is presented, along with a formal description. The design is based on a Model of Information Exploration -- MIE. An empirical study in which subjects interacted with a tightly coupled interface to a jobs/skills matching database confirms the power of tight coupling.
© All rights reserved Ahlberg and Truve and/or Cambridge University Press
Ahlberg, Christopher and Wistrand, Erik (1995): IVEE: an Information Visualization and Exploration Environment. In: Gershon, Nahum D. and Eick, Stephen G. (eds.) InfoVis 1995 - IEEE Symposium On Information Visualization 30-31 October, 1995, Atlanta, Georgia, USA. pp. 66-73.
Ahlberg, Christopher and Shneiderman, Ben (1994): Visual Information Seeking: Tight Coupling of Dynamic Query Filters with Starfield Displays. In: Adelson, Beth, Dumais, Susan and Olson, Judith S. (eds.) Proceedings of the ACM CHI 94 Human Factors in Computing Systems Conference April 24-28, 1994, Boston, Massachusetts. pp. 313-317.
This paper offers new principles for visual information seeking (VIS). A key concept is to support browsing, which is distinguished from familiar query composition and information retrieval because of its emphasis on rapid filtering to reduce result sets, progressive refinement of search parameters, continuous reformulation of goals, and visual scanning to identify results. VIS principles developed include: dynamic query filters (query parameters rapidly adjusted with sliders, buttons, maps, etc.), starfield displays (two-dimensional scatterplots to structure result sets and zooming to reduce clutter), and tight coupling (interrelating query components to preserve display invariants and support progressive refinement combined with an emphasis on using search output to foster search input). A FilmFinder prototype using a movie database demonstrates these principles in a VIS environment.
© All rights reserved Ahlberg and Shneiderman and/or ACM Press
Ahlberg, Christopher and Shneiderman, Ben (1994): The Alphaslider: A Compact and Rapid Selector. In: Adelson, Beth, Dumais, Susan and Olson, Judith S. (eds.) Proceedings of the ACM CHI 94 Human Factors in Computing Systems Conference April 24-28, 1994, Boston, Massachusetts. pp. 365-371.
Research has suggested that rapid, serial, visual presentation of text (RSVP) may be an effective way to scan and search through lists of text strings in search of words, names, etc. The Alphaslider widget employs RSVP as a method for rapidly scanning and searching lists or menus in a graphical user interface environment. The Alphaslider only uses an area less than 7 cm x 2.5 cm. The tiny size of the Alphaslider allows it to be placed on a credit card, on a control panel for a VCR, or as a widget in a direct manipulation based database interface. An experiment was conducted with four Alphaslider designs which showed that novice Alphaslider users could locate one item in a list of 10,000 film titles in 24 seconds on average, an expert user in about 13 seconds.
© All rights reserved Ahlberg and Shneiderman and/or ACM Press
Ahlberg, Christopher, Williamson, Christopher and Shneiderman, Ben (1992): Dynamic Queries for Information Exploration: An Implementation and Evaluation. In: Bauersfeld, Penny, Bennett, John and Lynch, Gene (eds.) Proceedings of the ACM CHI 92 Human Factors in Computing Systems Conference June 3-7, 1992, Monterey, California. pp. 619-626.
We designed, implemented and evaluated a new concept for direct manipulation of databases, called dynamic queries, that allows users to formulate queries with graphical widgets, such as sliders. By providing a graphical visualization of the database and search results, users can find trends and exceptions easily. Eighteen undergraduate chemistry students performed statistically significantly faster using a dynamic queries interface compared to two interfaces both providing form fill-in as input method, one with graphical visualization output and one with all-textual output. The interfaces were used to explore the periodic table of elements and search on their properties.
© All rights reserved Ahlberg et al. and/or ACM Press
Shneiderman, Ben, Williamson, Christopher and Ahlberg, Christopher (1992): Dynamic Queries: Database Searching by Direct Manipulation. In: Bauersfeld, Penny, Bennett, John and Lynch, Gene (eds.) Proceedings of the ACM CHI 92 Human Factors in Computing Systems Conference June 3-7, 1992, Monterey, California. pp. 669-670.
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