While the goal of problem-solving in groups may be to solve socially constructed problems, intersubjectivity regarding goals and methods as well as the relative status of group members contribute to the emergence of both conflict and cooperation.  Conventionally, cooperation has been seen as adaptive in group problem-solving, while conflict has been seen as maladaptive.   The articles in this volume, however, represent the interrelated processes of conflict and cooperation among group members as complex and nuanced that (independently and jointly) affect group outcomes.