This document discusses several models of communication including: - The transmission model which views communication as a linear process of sending and receiving messages. - The SMCR model which separates communication into distinct parts like sender, message, channel, and receiver. - The transactional model which sees communication as an ongoing process of sending and receiving messages simultaneously. - The constitutive model which focuses on how an individual communicates and how that determines message interpretation. It also discusses concepts like speech acts, encoding/decoding, and theories of coregulation in communication.