Communication is a study of part of human communication. According to Berger and Chaffee, 'communication science' defined as Communication science seeks to understand the production, processing, and effects of symbol and signal systems by developing testable theories, containing lawful generalizations, that explain phenomena associated with production, processing, and effects.
It is difficult to defining the field because the developments of technology that have blurred the line between public and private communication and between mass and interpersonal communication.
At each descending level of the pyramid indicated, there is as increasing number of cases to be found. Each level presents its own particular set of problems for research and theorizing.
There are several different kinds of communication network.
Below this level, there are even more and more varied types of communication network based on some shared feature of daily life on environment, an interest(music) need
According to this criterion, mass communication involved several society wide communication process.