A process facilitator needs all the perceptions she can get. Ideally that means that you are an expert on body language and you are a psychic. If you are not, don't despair, just aim at becoming one along the way.
Just looking at and listening to a person can tell you volumes, if you have an idea what to look for. That is one reason why I personally don't keep detailed notes during a session, or engage in other involving rituals. I find it much more worthwhile to look at the person and observe what is going on.
Some of the body language you might want to watch for is:
- posture
- skin tone
- breathing
- eye movements
- hand gestures
- head movements
Some of the auditory indicators you might want to listen for are:
- voice pitch
- tempo
- rhythm
- use of words
What these various indicators can tell you are things like:
- Which of several possible areas is the most loaded one?
- Is the client looking at pictures, talking to herself, or feeling something?
- Is she associated into an incident, or dissociated from it?
- What are the person's thinking strategies?
- Answers to yes/no questions.
- When a process is done.
The client's body will answer most questions you might ask. She might not consciously be aware of it, and you might very well notice more than she does.
The more information you get from a person the better you can evaluate what to do next. And often the information you can get by direct observation is better than what the person verbally tells you.