This document discusses communication models and theories. It begins by describing Shannon and Weaver's original model of communication which included a sender, channel, and receiver. It then discusses other models such as the transmission model where information is sent from an encoder to a decoder. The document also discusses semiotic rules of communication, including syntactic, pragmatic, and semantic rules. It describes several theories of communication including Barnlund's transactional model and the constitutive model. The document discusses sources of communication noise and defines communication as an academic discipline that studies both verbal and nonverbal messages.