There are different theories given by different experts:-
Harold Lasswell - One of the earliest attempts to describe the communication process was Harold Lasswell's "Who says what to whom with what effect."
Wilbur Schramm - this model includes encoder interpreter and decoder with the feedback mechanism.
Claude Shannon - Shannon and Weaver suggested a linear model where a "sender encodes a message that is transmitted through a channel to be decoded by a receiver."
Norbert Wiener – He originally proposed a concept called cybernetics. This is a process model based on built-in monitoring of the environment and modifying components of the overall system.
The Purchase Funnel – It is a variant of communication theories like AIDA (‘attention’, ‘interest’, ‘desire’, ‘action’) or DAGMAR* which became popular in the 1950’s and ‘60’s.
Purchase Funnel The ‘Purchase Funnel’ is one of the most prevalent models of the consumer’s decision making process used by marketers today. It’s found in many industries, and in the automotive industry, it looks like this:
These models were derived from classical learning theory and have in common the assumption that, for marketing communications to be effective, the consumer must go through a linear sequence of mental events, with each stage dependent on the success of the previous stage, producing a ladder-like progression towards purchase.
Total Quality Communication Model
Assembling these parts results in a model of communication that incorporates the primary variables that a communicator may manipulate in the communication process to increase effectiveness and efficiency of communication in organizations.
References:-
ü http://images.google.co.in/images?hl=en&q=Communication+Theory&gbv=2
ü http://images.google.co.in/imgres?imgurl=http://adotas.cachefly.net/wp/wp-content/uploads/2006/03/funnel2.jpg&imgrefurl=http://www.adotas.com/2006/03/is-the-purchase-funnel-dead-how-the-internets-rewired-consumer-buying-behavior/&h=272&w=400&sz=52&hl=en&start=5&sig2=7Sqxrs_4v6VVTphanJGkhg&tbnid=h1SmL9HdmhxpuM:&tbnh=84&tbnw=124&ei=ZkSPRv63EoaciQHkysDaBQ&prev=/images%3Fq%3DCommunication%2BTheory%26gbv%3D2%26svnum%3D10%26hl%3Den
ü http://images.google.co.in/images?svnum=10&hl=en&gbv=2&q=Harold+Lasswell%27s+Communication+Theory
ü http://images.google.co.in/imgres?imgurl=http://www.baclass.panam.edu/comm2002/Textbook/illustrations/laswell.gif&imgrefurl=http://www.baclass.panam.edu/comm2002/Textbook/Chapter02.html&h=75&w=434&sz=5&hl=en&start=5&sig2=6ias8jh8L9Mghzboh-vrsQ&tbnid=K4ycnTp51GdaDM:&tbnh=22&tbnw=126&ei=WlePRv_CLKiyigHZiZj3BQ&prev=/images%3Fq%3DHarold%2BLasswell%2527s%2BCommunication%2BTheory%26gbv%3D2%26svnum%3D10%26hl%3Den
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