Group Decision and Negotiation, 3:7-10 (1994) 9 1994 Kluwer Academic Publishers Special Issue: Negotiation Modeling and Support Editorial GREGORY KERSTEN School of Business Carleton University, 1125 Colonel By Drive, Ottowa, Ontario, Canada KIS 5B6 ROMAN KULIKOWSKI Systems Research Institute, Polish Academy of Sciences, Warsaw, Poland ZBIGNIEW NAHORSKI Systems Research Institute, Polish Academy of Sciences, Warsaw, Poland In June of 1992 the Systems Research Institute of the Polish Academy of Sciences organized a Workshop on Support Systems for Decisions and Negotiation. More than eighty presented papers dealt with the design and application of decision support systems, modeling and support for group decision making, negotiation, mediation, and bargaining. Many of the papers introduced novel and interesting concepts. Other papers presented applications from a variety of areas, for exam- pie, environmental planning, water resource management, petroleum exploration, and engineering design. The discussions at the Workshop showed that many papers were of journal quality. It was agreed that the most appropriate journal for such papers would be Group Decision and Negotiation. This was a consensus decision made quickly and without a support system. Our preemptive criterion was the satisfaction of the readers of the Journal; we believe that you will find the articles interesting and inspiring. An additional attribute was the fact that the Workshop was spon- sored by, among others, the TIMS College on Group Decision, which also coop- erates with the editorial board of the Journal. Right after this initial decision, we were faced with another, namely, what the focus of this special issue should be. Selection of papers for publication proved to be another multi-person and multiple-criteria decision problem. A traditional criterion--quality--was not sufficient because there were too many good papers. Space in this volume could be found for only eight of the eighteen initially selected papers. We added the thematic diversity criterion in an attempt to show the read- ers a variety of viewpoints and approaches. We also wanted to present work rep- resentative of different "schools" and to include a mix of theoretical and applied articles. The articles that appear in this special issue are intended to present the reader with diverse issues in negotiation modeling and support. They cover distributive and integrative negotiations, different phases of the negotiation process including the prenegotiation phase, conflict resolution, concession making, threats, and fi-