Functions and processes of communication

In the Discussion Forum type a 600-word (minimum) paper about Chapter 11 (Page 170 to page 185). What is your understanding of the material covered? Also, address in your own words:

Describe the functions and processes of communication
Contrast downward, upward, and lateral communication through small-group networks and the grapevine.
Describe how to channel richness underlies the choice of a communication channel
Identify common barriers to effective communication