Up to 93 % of communication is non-verbal. Including tone of voice, eye movement and more. The eyes communicate more that any other part of the human anatomy. The smile. There are 50 or so different types of human smiles. Gestures communicate. Hand signals can communicate without the use of any speech. Watch your body language. Avoid shifting eyes and head quickly during conversation when someone asks you a question. Do not look down or to the side. Look directly at the person with a sense of confidence.