According to the model, group members balance their concern for satisfying personal needs and interests with their concern for satisfying the needs and interests of others in different ways. The intersection of these two dimensions ultimately leads individuals towards exhibiting different styles of conflict resolution. The dual model identifies five with number four being the target to complete the cycle and illuminate the issue at hand. Conflict resolution styles or strategies that individuals may use depend on their dispositions toward pro-self or pro-social goals. RDT, introduced by Leslie Baxter and Barbara Matgomery (1988), explores the ways in which people in relationships use verbal communication to manage conflict and contradiction as opposed to psychology. This concept focuses on maintaining a relationship even through contradictions that arise and how relationships are managed through coordinated talk. RDT assumes that relationships are composed of opposing tendencies, are constantly changing, and tensions arises from intimate relationships. Concepts   Strategy of Conflict, by Thomas Schelling, is the study of negotiation during conflict and strategic behavior that results in the development of "conflict behavior." This idea is based largely on Game Theory includes a "A Reorientation of Game Theory" in which Schelling discusses ways in which one can redirect the focus of a conflict in order to gain advantage over an opponent. Within Peace and conflict studies a definition of conflict resolution is presented in Peter Wallensteen's book "Understanding Conflict Resolution":  "[Conflict resolution is] "a social situation where the armed conflicting parties in a (voluntarily) agreement resolve to live peacefully with – and/or dissolve – their basic incompatibilities and henceforth cease to use arms against one another""  'The conflicting parties' concerned in this definition are formally or informally organized groups engaged in intrastate or interstate conflict. 'Basic incompatibility' refers to a severe disagreement between at least two sides where their demands cannot be met by the same resources at the same time. One theory discussed within the field of Peace and conflict studies is conflict resolution mechanisms: independent procedures in which the conflicting parties can have confidence. They can be formal or informal arrangements with the intention of resolving the conflict. In "Understanding Conflict Resolution" Wallensteen draws from the works of Coser, Galtung and Schelling, and presents seven distinct theoretical mechanisms for conflict resolutions:   According to conflict database Uppsala Conflict Data Program (UCDP)'s definition war may occur between parties who contest an incompatibility. The nature of an incompatibility can be territorial or governmental, but a warring party must be a "government of a state or any opposition organization or alliance of organizations that uses armed force to promote its position in the incompatibility in an intrastate or an interstate armed conflict".