An arrangement among actual organizations (or some of their parts) and individuals which carries out functions as though they were provided by a single organization, although the arrangement is not a separate organization. Some emerging health care networks or their programs are virtual organizations. For example, some communities handle teen-aged pregnancy problems with physicians, the local hospital, the local health department, social welfare agencies, churches, and schools each providing some services, working together seamlessly as though the “teen-age pregnancy” program were provided by a single organization.