Micro Study is light sparring (not prearranged) where you can practice new applications in a less threatening atmosphere. There should be no fear during these session as punches and kicks are controlled by both participants.
Micro study helps develop your vision, response to attacks, positioning and range. At the earlier stages of Micro Study one should have a third person monitoring to keep the session under control and not let the session escalate.
A mouth piece is always recommend for these training sessions.