Non-Verbal Communication:
It is believed that non-verbal communication is the most significant aspect of communication.
Dr. Albert Mehrabian, author of Silent Messages, conducted several studies on nonverbal communication and found that 7% of any message is conveyed through words, 38% through certain vocal elements (tone, pitch, etc.), and 55% through nonverbal elements (facial expressions, gestures, posture, etc).
While it depends on the person or the situation, it is believed that 60 to 90% of communication is non-verbal.