The document discusses three models of communication:
1) Linear communication is one-way with no feedback from the receiver to sender. Examples given are a presentation or speech.
2) Interactive communication is two-way with feedback from the receiver to sender. The Schramm model depicts this with encoding, decoding, and feedback between sender and receiver.
3) Transactional communication is circular with all participants actively exchanging roles as sender and receiver. Feedback is given freely between all members to clarify the message and address any barriers to understanding.