This document summarizes 15 theories of communication and mass media:
1) Structural/functional, cognitive/behavioral, interactionist, interpretive, and critical theories examine how social structures, individual psychology, social interaction, meaning-making, and power dynamics influence communication.
2) Classical theories include the authoritarian, libertarian, and social responsibility theories, which are based on political philosophies and view the role of media differently.
3) Early 20th century theories like the magic bullet theory and two-step flow theory posited direct and indirect effects of media on audiences. Later theories examined uses and gratifications, agenda-setting, dependency, cultivation effects, and diffusion of innovations.
4) Contemporary theories