1. Several classic models of communication are summarized, including Laswell's model, Shannon and Weaver's mathematical model, and Berlo's SMCR model.
2. Laswell's model describes the basic elements of any communication act: who communicates what through which channel to whom with what effect. Shannon and Weaver's model conceptualized communication as involving a sender, encoder, message, channel, decoder, and receiver.
3. Berlo's SMCR model builds on earlier concepts but emphasizes that both the sender and receiver are influenced by their communication skills, attitudes, knowledge, social system, and the message is influenced by its content and coding within the communication channel.