This document discusses the role and history of media theory and research. It covers early theories from the 19th-20th centuries that examined the role of mass communication in industrialized societies. Media effects research is also summarized, including propaganda studies, radio impact research, and television violence studies. The document then discusses limited effects theories, audience research approaches like uses and gratifications, and new directions in digital media research. Finally, it considers different philosophical approaches to media research like positivism, social constructionism, and the use of both qualitative and quantitative analysis methods.