Non-verbal communication is crucial to effective, positive impact. Be aware of how you look when you speak. Check not only your own body language, but that of others. Learn to speak and understand body talk.
A classic theory for the effectiveness of spoken communication was developed by the eminent psychologist Albert Mehrabian. Illustrated by this chart , it states that just 7 per cent of effective communication is verbal – conveyed by the words we say – whereas 38 per cent is vocal – derived from the way we say those words, our voice, tone, and inflection. Nonverbal communication, though, scores highest of all, at 55 per cent – expressed by our "body language".