“…Studies of group development span half a century and include impressionistic studies, which rely on experiences and reflections of observers (e.g., Bennis & Shepard, 1956;Bion, 1961), empirical studies using observational systems (e.g., Bales, 1950;Gersick, 1988), studies based on archi-val materials (e.g., Worchel, 1994), and cross-sectional survey studies (e.g., Wheelan, Murphy, Tsumura, & Kline, 1998).…”