Aristotle's classical model of communication focused on the roles of the speaker and audience in public speaking. Lasswell proposed a model to describe communication acts by answering who says what through which channel to whom with what effect. Shannon and Weaver's model illustrated communication as a linear process involving an information source, transmitter, receiver and destination. Berlo's SMCR model accounted for human variables like the source, message, channel and receiver. Newcomb's triangular model introduced the role of communication in maintaining equilibrium within a social system. Westley and McLean's model considered communication as beginning when a person responds selectively to their surroundings. Gerbner's model stressed the dynamic and selective nature of the communication process. Media dependency theory views audience