The document discusses several models of communication, including:
- Shannon and Weaver's mathematical model which views communication as transmission of information via a channel with entropy and redundancy.
- Non-linear models like Schramm's model which sees communication as reciprocal and Osgood-Schramm's model which substitutes "field of experience" with "personality".
- Gerbner's model acknowledges media's role in perceiving and communicating events and highlights gatekeeping.
- Westley and McLean's model provides a more systematic treatment of findings and is based on ideas of cognitive dissonance. It depicts several selection stages and feedback loops in the communication process.