In the hopes of inspiring yet another emotional layer to your characters, I add the following to the list of behaviors that do NOT work in effective communication.
Focusing on own feelings
Changing the subject
Taking the high moral ground
Trying to win
Hating to lose
Agreeing, but not really
Taking over the discussion
Becoming delicate and vulnerable
Facial expressions like boredom, anger
(This list comes from my dear friend Teresa LeYung Ryan and adapted by Emilio Escudero)
For the earlier mentioned behaviors that do NOT enhance effective communication, More on Plot and Emotion
Next will be a list of What Works.