External forces affect all group activities; no group exists in a social vacuum. Such forces as community values, community expectations, institutional values, parent group affiliations and control, inter group competition, and prestige and status affect every group-its member motivations, goals and means, and ongoing activities. These external forces are reflected largely through the beliefs, feeling and actions of he members. Examples of how external forces directly affect the actions of individuals have already been given. Communities are made up of people interacting as individuals and within groups to carry out the activities considered necessary to satisfy their needs. The community develops expectations of various groups, through these expectancies may vary widely from group to group. Certain groups, with certain kinds of members, are expected to perform specific functions for specific categories of people. The freedom with which any group in a community carries on its activities and functions is related to the total community definition of the function and role of that group.