For over forty years, Theories of Human Communication has facilitated the understanding of the theories that define the discipline of communication. The authors present a comprehensive summary of major communication theories, current research, extensions, and applications in a thoughtfully organized and engaging style. Part I of the extensively updated twelfth edition sets the stage for how to think about and study communication. The first chapter establishes the foundations of communication theory. The next chapter reviews four frameworks for organizing the theories and their contributions to the nature of inquiry. Part II covers theories centered around the communicator, message, medium, and communication with the nonhuman. Part III addresses theories related to communication contexts—relationship, group, organization, health, culture, and society. “From the Source” contributions from theorists provide insight into the inspirations, motivations, and goals behind the theories. Online instructor’s resource materials include sample syllabi, key terms, exam questions, and text graphics. The theories include those important for their continuing influence in the field as well as emerging theories that encourage thinking about issues in new ways. For a reasonable price, readers are able to explore the patterns, trends, trajectories, and intricacies of the landscape of communication theory and will have an invaluable resource for future reference.