A laboratory experiment was used to evaluate the effects of anonymity and evaluative tone on computer-mediated groups using a group decision support system to perform an idea-generation task. Evaluative tone was manipulated through a confederate group member who entered supportive or critical comments into the automated brainstorming system. Groups working anonymously and with a critical confederate produced the greatest number of original solutions and overall comments, yet average solution quality per item and average solution rarity were not different across conditions. Identified groups working with a supportive confederate were the most satisfied and had the highest levels of perceived effectiveness, but produced the fewest original solutions and overall comments.anonymity, evaluative tone, group problem solving, group decision support system, electronic meeting system

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A 2 85721 ABSTRACI Recent advances in information systems technology have made it possibk to support the work of interacting groups using networked personal cornputen. A laboratory experiment was conducted using a group decision support system to evaluate effects of anonymity and proximity on group process in automated group problem solving. Ikenty groups of four persons each performed an idea-generating task using an interactive electronic brainstorming program. This experiment's main fiidings wem (1) Group members working anonymously and apart generated more comments.(2) Working in the same room increased satisfaction. (3) Highest levels of perceived system effectiveness were reported under anonymity.