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I do not mean to overemphasize the importance of the power point/overhead
matter, it is nowhere near as important as the instructors ability to
communicate their ideas...the best power point in the world cant save a
poor instructor, all I mean to say is that if you reduce the "noise" in an
environment the more effective the communication. This is a basic tenant
of the Shannon-Weaver SMCR model of communication. There are, of course,
more complex models, but this servers as a good base.
The following link discusses the components of the SMCR model, including
noise created based on attitudes towards the sender of the message and the
message itself.
http://www.cultsock.ndirect.co.uk/MUHome/cshtml/introductory/sw.html
The basic idea idea for me is that if you are engaging and your audience
relates to you and actually has a desire to know what you want to teach
the learning process should be enhanced.