Studies published in the last five years (since 1975) concerning how groups behave, with particular emphasis on implications for the administrator who wishes to deal more effectively with groups, are reviewed. The 25 studies represent 11 journals, written by authors from six related disciplines. For discussion purposes, the studies are divided into three subject areas: group interaction, group process, and group performance. Group interaction refers to the nature of communication among group members. Group interaction variables that have frequently been studied are leadership style, sex composition of groups, and group size. Group process refers to the methods used by a group to accomplish its purposes. The following process variables are addressed: group discussion, conflict resolution, consensus, and risk-taking. Another area of importance to group process is the collective dilemma, which explores the issue of cooperation versus competition in a group situation. Such studies are also referred to as "Prisoner's Dilemma" or "Tragedy of the Commons". The earliest research on groups focused on group performance, examining whether students or workers performed better alone or in the presence of others. With the present day concern for accountability and emphasis on group decision-making and problem-solving, this issue remains one of the primary topics of investigation. It is proposed that those studies that represent the most recent variables under consideration concern member intellect, personality, group tradition, and process interventions. Process interventions refer to methods used to accomplish the group's purposes that may be employed to improve the performance of the group. Despite obvious missing links in group theory, applications for the educational administrators are addressed. A bibliography is included. (SW)