The document discusses several models of communication developed throughout history:
- Aristotle developed one of the first linear models in the 4th century BC focusing on the speaker, speech, audience, and effect but lacking feedback.
- Harold Lasswell presented a linear model in 1948 examining who communicates what message through which channel to whom with what effect.
- Claude Shannon and Warren Weaver's 1949 model added "noise" that can disrupt information transmission.
- Wilbur Schramm's 1955 interactive model depicted feedback and "fields of experience" to show communication as interactive between sender and receiver.
- Transactional models portray communication as dynamic with changing messages, roles, and shared understandings over time rather than sequential linear exchanges.