Organizations that are involuntary for their members (i.e. prisons and mental institutions).
Large social groups intentionally organized to achieve specific goals (i.e. government agencies, the United States Post Office, corporations, and higher education).
Organizations that exist to pursue some goal in common that participants believe has moral value or is good for society (also sometimes called voluntary associations).
Social influences outside an organization that affect its operation, and even its existence.
Organizations that pay people for their efforts and thereby provide jobs.