Volume 1. Contents: Preface. Part I: Introduction. J.H. Davis, Small-Group Research and the Steiner Questions: The Once and Future Thing. Part II: Social Aggregation and Combination Models. H.W. Crott, J. Werner, C. Hoffmann, A Probabilistic Model of Opinion Change Considering Distance Between Alternatives: An Application to Mock Jury Data. J.H. Davis, Group Decision Making and Quantitative Judgments: A Consensus Model. P.R. Laughlin, Group Decision Making and Collective Induction. R.S. Tindale, C.M. Smith, L.S. Thomas, J. Filkins, S. Sheffey, Shared Representations and Asymmetric Social Influence Processes in Small Groups. N.L. Kerr, R.J. MacCoun, G.P. Kramer, "When are N Heads Better (or Worse) Than One?": Biased Judgment in Individuals Versus Groups. T. Kameda, Procedural Influence in Consensus Formation: Evaluating Group Decision Making From a Social Choice Perspective. Part III: Social Information-Processing Models. G. Stasser, S.I. Vaughan, Models of Participation During Fact-to-Face Unstructured Discussion. B. Latané, Strength From Weakness: The Fate of Opinion Minorities in Spatially Distributed Groups. D. Gigone, R. Hastie, The Impact of Information on Group Judgment: A Model and Computer Simulation. E.H. Witte, The Extended Group Situation Theory (EGST): Explaining the Amount of Change. S. Galam, When Humans Interact Like Atoms. J.H. Davis, Concluding Remarks. Volume 2. Contents: Preface. Part I: Introduction. E.H. Witte, Small-Group Research and the Crisis of Social Psychology: An Introduction. Part IIGroup Structure and Composition. R.L. Moreland, J.M. Levine, M.L. Weingert, Creating the Ideal Group: Composition Effects at Work. W. Stroebe, M. Diehl, G. Abakoumkin, Social Compensation and the Köhler Effect: Toward a Theoretical Explanation of Motivation Gains in Group Productivity. H.A.M. Wilke, Status Congruence in Small Groups. J.C. Jesuino, Leadership: Micro-Macro Links. W. Scholl, Effective Teamwork -- A Theoretical Model and a Test in the Field. M. von Cranach, Toward a Theory of the Acting Group. Part III: Interpersonal Influence, Conflict, and Resolution. J.A. Pérez, G. Mugny, The Conflict Elaboration Theory of Social Influence. D. Frey, S. Schulz-Hardt, D. Stahlberg, Information Seeking Among Individuals and Groups and Possible Consequences for Decision Making in Business and Politics. M.A. Hogg, Social Identity, Self-Categorization, and the Small Group. J.M. Rabbie, H.F.M. Lodewijkx, A Behavioral Interaction Model: Toward an Integrative Theoretical Framework for Studying Intra- and Intergroup Dynamics. E.H. Witte, Similarities Among Various Conceptual Positions and Theoretical Points of View.