Aristotle's Model: linear with sender, messenger, and receiver
Laswell's Model: communicator, message, channel, receiver, effect
Shannon-Weaver Model: sender, encoder, channel, noise/feedback, decoder, receiver
Berlo's Model: source, message, channel, receiver
Osgood and Schramm's Model: continuous and successful
Barnlund's Transactional Model: emphasizes barriers in communication