“…The conditions under which newcomers can change oldtimers' shared cognition were recently analyzed by Levine and his colleagues (Levine et al, 2003;Levine, Moreland, & Choi, 2001; see also Levine & Moreland, 1985). Although newcomers often interfere with group performance, for example by forcing oldtimers to expend time and energy in socialization activities (Levine & Moreland, 1999;Moreland & Levine, 1989), they can also improve this performance by introducing innovations that help the team work more effectively.…”