大众传播
Departmental structures within such colleges may separate research and instruction in professional or technical aspects of newspaper and magazine publishing, radio, television, and film. Mass communication research topics include media institutions and processes, such as diffusion of information, and media effects, such as persuasion or manipulation of public opinion. Outside of media history and communication law, research methods in mass communication fields have leaned toward empirical research, experimental studies and quantitative methods, such as public opinion polling and content analysis of news media. However, qualitative research, including ethnographic case studies, interviewing, and focus groups, has growing support in some specialties. Critical-cultural theory is less popular than in other "communication studies" programs.