“…Friendship networks affect individual and organizational well-being, yet we lack clear understanding of how they develop among professionals. Previous research has documented the importance of friendship ties for such internal operations of an organization as information sharing, decision making, and resource exchanges (e.g., Brass, 1984; Converse & Foa, 1993; Gibbons, 1996; Heimer, 1992; Krackhardt, 1992; Labianca, Brass & Gray, 1998; Lincoln & Miller, 1979), as well as for organizational outcomes (e.g., Krackhardt & Stern, 1988; Westphal, 1999) and interorganizational relationships (e.g., Allen, 1977; Bouty, 2000; Cook & Whitmeyer, 1992; Fichman & Goodman, 1996). Given the crucial roles of friendship in organizations, it seems equally critical that we develop greater understanding of dynamics in friendship networks among professionals.…”