Two processes that detract from the quality of group decision-making are:

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Group polarization is a process in which group decisions become more extreme than individual decisions. Groupthink is a process in which group members conform to the opinions of the leader or the majority, without questioning the decision critically. Both of these processes can lead to poor decision-making outcomes. Social loafing and social facilitation are not necessarily detrimental to decision-making, as they depend on the specific circumstances of the group. Deindividuation is more associated with changes in individual behavior in a group context, rather than with group decision-making.

Two Processes That Detract from the Quality of Group Decision-Making