Group structure consists of rules, norms, roles, and status that define how groups are organized. It influences group performance, which is a group's ability to complete tasks according to set standards. Specifically, high group cohesion can lower performance if it causes groups to prioritize member needs over external goals. Additionally, highly cohesive groups may conform to norms of lower productivity despite their ability to perform better. Group polarization also affects performance, where groups make more extreme decisions than their average member initially supported.