Information processing in groups has long been seen as a cooperative process. In contrast with this assumption, group members were rarely found to behave cooperatively: They withhold unshared information and stick to initial incorrect decisions. In the present article, we examined how group members' cooperative and competitive motives impact on group information processing and propose that information sharing and use in groups could be seen as strategic behavior. We reviewed the latest developments in the literature investigating different forms of strategic information processing and their underlying mechanisms. This review suggests that explicit cooperative goals are needed for effective group decision-making.When complex problems are to be solved, groups are often used to make decisions. Juries decide about the guilt of an alleged murderer, selection panels about the best candidate for a new position, industrial executive panels about the development of a new factory, and boards of managers about future business plans. One reason for using groups is that its members should possess a larger pool of information, knowledge, and skills than a single person, which is likely to lead to more informed decisions. This ideal perspective on the role of groups has had a strong inf luence on the research conducted for the last 25 years in the area of group decision-making ( for a review, see Stasser & Titus, 2003), developed on the assumption that group members work cooperatively when making decisions (Wittenbaum, Hollingshead, & Botero, 2004). The present article reconsiders this classic cooperative assumption and reviews recent literature suggesting that group decision-making situations involve a mixture of cooperative and competitive motives that affect the extent to which members share and use their information.
Information Sharing and Use in Group Decision-MakingGroup decision-making ref lects group-level information processing (Hinsz, Tindale, & Vollrath, 1997) that involves both information sharing and information use. Information sharing refers to the pooling of all informational resources that group members possess, which can be shared information, namely information known to all group members, and unshared information, namely information known only by one or some group members (Stasser & Titus, 1985). Unshared information is the key element that allows groups to reach decisions of superior quality, as compared to individual decision, if their members share this information (Stasser & Titus, 2003): Indeed, pooling unshared information allows the group to work with a body of information which is larger than that of each single member. Research on information pooling, however, has repeatedly shown that group members pool and repeat more shared than unshared information, a phenomenon called information-sampling bias (Stasser & Titus, 1985, 1987; for a meta-analysis, see Lu, Yuan, & McLeod, 2012). This bias has been mainly attributed to the superior probability of shared information to be mentioned during dis...