Many of those schools that teach the jujutsu/ taijutsu aspects of the art have codified the art into various levels including Shoden (first transmission), Chuden (middle level transmission), Okuden (hidden transmission), Kuden (oral transmission) amongst others.
Many martial arts schools that teach grappling/unarmed combat aspects of the art have codified the art into various levels, such as Shoden (first transmission), Chuden (middle level transmission), Okuden (hidden transmission), and Kuden (oral transmission) amongst others.