Preface (B. Markovsky et al.). Performance under different contingent reward systems: a reconceptualization of the cooperative-competitive-individualistic literature (J.M. Chertkoff, D.J. Mesch). A reformulated social identity theory (C. Barnum). Decision making in a dyad's response to a fire alarm: a computer simulation investigation (W.E. Feinberg, N.R. Johnson). A solidaristic theory of social order (Satoshi Kanazawa). Comfort regulation as a morphogenetic principle: local dynamics of dominance, competition, and attachment (T.S. Smith, G.T. Stevens). Transitions in teamwork in new organizational forms (G. DeSanctis, M.S. Poole). "I think we can, I think we can...": the role of efficacy beliefs in group and team effectiveness (L.J. Mischel, G. Northcraft). Network connection and exchange ratios: theory, predictions and experimental tests (D. Willer, J. Skvoretz). Who benefits from being bold: the interactive effects of task cues and status characteristics on influence in mock jury groups (L. Slattery Rashotte, L. Smith-Lovin). The theory of structural ritualization (J.D. Knottnerus). Grounding groups in theory: functional, cognitive, and structural interdependencies (S. Lindenberg).