Some important considerations for observing human behavior:
Non-Verbal Communication (Body Language): What can you infer from how they sit, move, behave? Is your subject tense or stressed out?
- Posture can reveal much about a person's state of mind. Depending on whether he or she is slumped over or sitting rigidly upright, your subject may be sleepy, actively engaged in something, or even stressed out.
- Nervous tics: What the person is doing with their hands and feet. Are they playing with their hair or touching their face?
- Facial Expressions: Pay attention to the eyes. What are they looking at, or even more importantly not looking at.
- Tone of voice can reveal the speaker's attitude toward their topic of conversation.
- Dialogue: Listen for context, but also subtext. Does the speaker seem to be straight-forward about the topic or purposefully ambiguous. Are they serious or genial? Listen also for sarcasm.