The ten commandments of communication:

a. Seek to clarify your ideas before communicating.

b. Examine the true purpose of each communication.

c. Consider the total physical and human setting whoever you communicate

d. Consult others, when appropriate in planning communications.

e. Be meaningful while you communicate, of the overtones as well as the basic content of your message.

f. Take the opportunity, when it arises to convey something of help or value to the receiver.

g. Follow up your communications.

h. Communicate for tomorrow as well as for today.

i. Be sure your actions support your communications.

j. Seek not only to be understood but to understand as well - be a   good listener.

 Body language 

GESTURE	MEANING
Arms crossed on Chest	Defensiveness

Useful things by Google :