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Theorist: Everett Rogers, Definition: A theory that seeks to explain how, why, and at what rate new ideas and technology spread through cultures, Core Idea: Innovations diffuse through social networks over time.

Theorist: Frank Dance, Definition: A model of communication that emphasizes the simultaneous sending and receiving of messages in a continuous process with past, present, and future contexts influencing the understanding between communicators, Core Idea: Communication is an ongoing, reciprocal process influenced by all the previous interactions between the parties.

Theorist: Paul Lazarsfeld, Bernard Berelson, and Hazel Gaudet, Definition: A theory that suggests ideas flow from mass media to opinion leaders, and from them to a wider population., Core Idea: Opinion leaders play a critical role in the flow of media messages and the shaping of public opinion.

Theorist: Maxwell McCombs and Donald Shaw, Definition: A theory stating that the media doesn't tell us what to think, but what to think about by selecting issues they consider important, Core Idea: Media attention increases public awareness and concern for salient issues.

Theorist: Kurt Lewin, Definition: A theory that explains the process by which a relatively small number of people in the media industry control what material eventually reaches the audience, Core Idea: Gatekeepers within the media filter and select news stories and events based on their judgment.

Theorist: George Gerbner, Definition: A theory which examines the long-term effects of television, Core Idea: The more time people spend 'living' in the television world, the more likely they are to believe social reality aligns with reality portrayed in television.

Theorist: Stuart Hall, Definition: A theory of communication that suggests media texts are encoded with meaning by the producer which the audience then decodes, possibly in different ways, Core Idea: The meaning is not fixed in the media text but is instead negotiated by the audience.

Theorist: George Herbert Mead, Definition: A theory that focuses on the interaction between individuals through the use of symbols and shared meaning, Core Idea: Human interaction and communication are mediated by symbols, such as words and gestures.

Theorist: Stella Ting-Toomey, Definition: A theory which looks at how individuals from different cultures manage conflict negotiation and maintain face, Core Idea: The concept of maintaining 'face' influences conflict resolution across different cultures.

Theorist: Sandra Harding and Julia T. Wood, Definition: A theory that focuses on how individuals' experiences, knowledge, and communication behaviors are shaped by the social groups to which they belong, Core Idea: Social groups within a culture have different standpoints which affect their perspectives and communication.

Theorist: Elisabeth Noelle-Neumann, Definition: A theory that suggests individuals who perceive their opinions as being in the minority are less likely to speak out in public situations, Core Idea: Public opinion influences individuals' willingness to express their own opinion.

Theorist: Gerry Philipsen, Definition: A theory that explores the manner in which groups communicate based on societal, cultural, and other contextual factors, Core Idea: Distinctive cultures have distinctive speech codes, which are invoked in social interaction.

Theorist: Sandra Petronio, Definition: A theory that explains how people manage the disclosure of private information, Core Idea: People establish personal privacy boundaries which they manage and negotiate with others.

Theorist: Cheris Kramarae, Definition: A theory that suggests that underrepresented groups are muted because their experiences are not expressed in the dominant modes of communication, Core Idea: The language of a culture reflects the interests and focuses of dominant groups.

Theorist: Richard E. Petty and John Cacioppo, Definition: A model that explains how persuasive communications can lead to attitude changes, through either a central route (where people are influenced by the content of the message) or a peripheral route (where people are influenced by other cues and not necessarily the content), Core Idea: The route of information processing in persuasion depends on the individual's level of motivation and ability to evaluate the message.

Theorist: Irwin Altman and Dalmas Taylor, Definition: A theory that describes the development of interpersonal relationships as a slow process of increasing disclosure and intimacy, Core Idea: Self-disclosure increases in breadth and depth as people develop closer relationships.

Theorist: Elihu Katz, Jay G. Blumler, and Michael Gurevitch, Definition: A theory that looks at the ways media consumers choose media to fulfill their various needs and desires, Core Idea: Audience members take an active role in selecting and using media to satisfy their desires.

Theorist: Sandra Ball-Rokeach and Melvin DeFleur, Definition: A theory that proposes that the more a person depends on media to meet needs, the more important that media will be to the person, and the more effects that media will have on the person, Core Idea: Media effects are enhanced by the degree to which an individual depends on media.

Theorist: Richard L. Daft and Robert H. Lengel, Definition: A theory that suggests different communication media have different capacities to effectively convey information, Core Idea: The richer the medium, the more effectively it communicates complex messages.

Theorist: Leslie Baxter and Barbara Montgomery, Definition: A theory that examines the struggle between opposing tendencies or forces in interpersonal relationships, Core Idea: Relationships are dynamic and ever-changing due to the interplay of contradictory social forces.

Theorist: Judee K. Burgoon, Definition: A theory that looks at how individuals respond to unanticipated violations of social norms and expectations, Core Idea: Violation of expectations can provoke different responses based on the nature of the violation and the individuals involved.

Theorist: Charles Berger and Richard Calabrese, Definition: A theory that posits that people have a need to reduce uncertainty about others by gaining information about them, Core Idea: Initial interactions with others are driven by a desire to predict behavior and reduce uncertainties.

Theorist: Howard Giles, Definition: A theory that explains how individuals adjust their communication styles to others during social interaction, Core Idea: People change their speech and behavior to accommodate or diverge from their conversational partners.