AbstractThis study examined the effects of using a group decision support system (GDSS) and outside facilitation support in a three‐hour team‐building process on the attainment of “team.” Twenty‐four preexisting work groups (N = 186) were randomly assigned to three treatments: (1) a facilitated team‐building process without computer support, (2) a facilitated team‐building process with computer support, and (3) normally scheduled meetings without a facilitation or computer support. Twelve dependent “team” measures were assessed using a self‐report questionnaire following the team‐building session (immediate effect) and following the next normally scheduled group meeting (delayed effect).On immediate‐effect measures, both facilitated team‐building processes resulted in higher member ratings of group process than ratings for meetings with no outside facilitation. On most measures, the positive immediate effects did not last over time, indicating that the three‐hour team‐building session was not effective. The implications for practice are severe in that both team building and GDSS technology are often implemented as one‐time interventions. It is common practice to use these techniques and/or methods as a three‐ to four‐hour component of a development session or as part