Once a goal is clearly established and accepted by most members, one of its more essential functions is to set a direction for group activities. Groups often find that if they specialize the tasks of their members they are more effective. Once a group has developed a membership mix that seems to “work,” the members and their leaders attempt to maintain it, even under pressure for change. Groups acquire high status in a variety of ways, including through their past accomplishments, their functional importance to the organization, rigorous membership admission standards, and high financial earnings. Group size is a critical variable in relation to group attraction, cohesion, or morale. Group boundaries serve psychological purposes and do not necessarily take the form of physical walls. The communication network needed among the members may be very different during the various stages of group work.