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Advances in computing and telecommunications technology are changing how people can meet and make group decisions. Technological changes help people cross physical, social, and psychological boundaries, and have secondary effects on group behavior and decision making. Experiments show that, compared with a face-to-face meeting, a computer-mediated discussion leads to delays; more explicit and outspoken advocacy; “flaming;” more equal participation among group members; and more extreme, unconventional, or risky decisions. Technological and social psychological variables that cause these effects in laboratory groups do not scale at equal rates. Technological change in organizational group decision making can lead to outcomes not seen in the laboratory, which makes it essential to do field research. Three phenomena observed in field studies are redistributions of work time, relative …