Use the language is concise, clear. Note the user interface incorporates both languages such as: voice, intonation, hand movements, head ...During the talks, the negotiations so often pay attention to non-verbal gestures of the modified side effects such as: have the legs or idly?, their eyes are looking straight into your eyes?, They have the obturator into the mouth when talking?, .... To when noticed a series of gestures as such, you will have the basis to judge viewed the other side there are honest honest, anxiety, anger, or you will have the language communication and language to match.
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