Prior to discussion, members of decision-making groups often possess a certain amount of decision-relevant information that others in the group do not hold. This is referred to as unshared information and stands in contrast to the shared information that all group members possess. One objective of group discussion is to enable members to exchange their unshared information. Research suggests, however, that groups often discuss more oftheirshared than their unshared information overall, and that they discuss their shared information first. A dynamic information sampling model that predicts these results is reviewed. Several empirical tests of this model are summarized, and a computer program that operationalizes the model is described. The computer program provides an efficient means of generating specific predictions for empirical studies andfor exploring the expected impact on group discussion of varying the model's input parameters.
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References
1.
Bernthal, P. R. , & Insko, C. A. (1993). Cohesiveness without groupthink: The interactive effects of task and social cohesion. Group and Organization Management, 18, 66-87.
2.
Burnstein, E. , & Vinokur, A. (1977). Persuasive argument and social comparison as determinants of attitude polarization. Journal of Experimental Social Psychology, 13, 315-332.
3.
Courtwright, J. A. (1978). A laboratory investigation of groupthink. Communication Monographs, 45, 229-246.
4.
Engel, B. T. (1992, May). The sharing of information in decision-making groups: Some effects of group structure. Paper presented at the 64th annual meeting of the Midwest Psychological Association, Chicago.
5.
Flowers, M. L. (1977). A laboratory test of some implications of Janis's groupthink hypothesis. Journal of Personality and Social Psychology, 35, 888-896.
6.
Fodor, E. M. , & Smith, T. (1982). The power motive as an influence in group decision making. Journal of Personality and Social Psychology, 42, 178-185.
7.
Gigone, D. , & Hastie, R. (1993). The common knowledge effect: Information sharing and group judgment. Journal of Personality and Social Psychology, 65, 959-974.
8.
Hastie, R. , Penrod, S. D., & Pennington, N. (1983). Inside the jury. Cambridge, MA: Harvard University Press.
9.
Hoffman, L. R. (1979). The group problem solving process: Studies of a valence model. New York: Praeger.
10.
Janis , (1982). Psychological studies of policy decisions and fiascos. Boston: Houghton Mifflin.
11.
Larson, J. R., Jr. , Christensen, C., Abbott, A. S., & Franz, T. M. (in press). Diagnosing groups: Charting the flow of information in medical decision making teams. Journal of Personality and Social Psychology, 71, 315-330.
12.
Larson, J. R., Jr. , Foster-Fishman, P. G., & Franz, T. M. (in press). Leadership style and the discussion of shared and unshared information in decision-making groups. Personality and Social Psychology Bulletin.
13.
Larson, J. R., Jr. , Foster-Fishman, P. G., & Keys, C. B. (1994). The discussion of shared and unshared information in decision-making groups. Journal of Personality and Social Psychology, 67,446-461.
14.
Larson, J. R., Jr. , & Lavery, T. A. (1997). Evidence for a discussion-induced primacy effect in group decision making. Paper presented at the 69th annual meeting at the Midwest Psychological Association, Chicago, IL.
15.
Leana, C. R. (1985). A partial test of Janis' groupthink model: Effects of group cohesiveness and leaders behavior on defective decision making. Journal of Management, 11, 5-17.
16.
McCauley, C. (1989). The nature of social influence in groupthink: Compliance and internalization. Journal of Personality and Social Psychology, 57, 250-260.
17.
Mohamed, A. A. , &Wiebe, F. A. (1996). Toward aprocess theory of groupthink. Small Group Research, 27,416-430.
18.
Moorhead, G. , & Montanari, J. R. (1986). An empirical investigation of the groupthink phenomenon. Human Relations, 39, 399-410.
19.
Onghena, P. (1993). A theoretical and empirical comparison of mainframe, microcomputer, and pocket calculator pseudorandom number generators. Behavior Research Methods, Instruments, and Computers, 25, 384-395.
20.
Penrod, S. D. , & Hastie, R. (1980). A computer simulation of jury decision making. Psychological Review, 87, 133-159.
21.
Schittekatte, M. , & Van Hiel, A. (1996). Effects of partially shared information and awareness of unshared information on information sampling. Small Group Research, 27, 431-449.
22.
Stasser, G. (1988). Computer simulation as a research tool: The DISCUSS model of group decision making. Journal of Experimental Psychology, 24, 393-422.
23.
Stasser, G. , Stewart, D. D., & Wittenbaum, G. (1995). Expertroles and information exchange during discussion: The importance of knowing who knows what. Journal of Experimental Social Psychology, 31, 244-265.
24.
Stasser, G. , Taylor, L. A., & Hanna, C. (1989). Information sampling in structured and unstructured discussions of three-and six-person groups. Journal of Personality and Social Psychology, 57, 67-78.
25.
Stasser, G. , & Titus, W. (1985). Pooling of unshared information in group decision making: Biased information sampling during discussion. Journal of Personality and Social Psychology, 48, 1467-1478.
26.
Stasser, G. , & Titus, W. (1987). Effects of information load and percentage of shared information on the dissemination of unshared information during group discussion. Journal of Personality and Social Psychology, 53, 81-93.
27.
Stephan, F. F. , & Mishler, E. G. (1952). The distribution of participation in small groups: An exponential approximation. American Sociological Review, 17, 698-708.
28.
Stewart, D. D. , & Stasser, G. (1995). Expert role assignment and information sampling during collective recall and decision making. Journal of Personality and Social Psychology, 69, 619-628.
