selective dissemination of information(A service provided by a library or other agency that periodically notifies users of new publications, report literature or other data sources in subjects in which the user has specified an interest)
differentiation(The development of cells so that they are capable of performing specialized functions in the organs and tissues of the organisms to which they belong)
social differentiation(A concept associated with evolutionary theories of history and with structural functionalism. Societies are seen as moving from the simple to the complex via a process of social change based on structural differentiation)