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Abstract
Current computer-mediated discussion systems usually force an elaborate hierarchical structure on the annotations of a discussion. Applying existing visualization techniques can allow a more free and natural structure. GraffiDis is a discussion system supporting computer-mediated asynchronous and synchronous discussion. The discussions conducted with the system consist of graphical annotations including text and graphical elements. The history of the discussion is visualized by fading the older annotations to the background of the discussion. Using a simple slider, a user can browse the history of the discussion forward and backward. This article describes the system and the visualization technique with the aid of 2 sample discussions. Experiences gained by using the system indicate that GraffiDis is especially suitable for conducting discussions that have a clear target provided in the form of a background picture.