Human skill can be classified into human control skill and
human motion skill. Human control skill is considered as a
human decision making process to select the appropriate
motions to execute the task according to the states. Human
motion skill is the skilled human operator’s superior
movement to execute the task when one knows what to do. In
this skill classification, skill is hierarchical: the human control
skill is the high level skill in decision making process, and the
human motion skill is the low level skill used to execute the
decided task in a certain state. Therefore, a complete skill
transfer process should include both human control skill and
human motion skill.