Four Aspects

Chuan Dao refers to the totality of the philosophy of the heavenly and
human relations, the rules of courtesy, martial virtue and the cultivation of
forbearance. It includes what is and is not permitted under the governance of
the spirit of Kung Fu.

Chuan Li refers to the overall theory and methodology for physical
improvement, self-defense, cultivation of the ethical sense, and spiritual
development, as well as the theory of unarmed self-defense, the use of
weapons, and Chi Kung.

Chuan Yi refers to the techniques assembled for application in the various
unarmed combat, weapon and Chi Kung forms, or tao lu.

Chuan Kung refers to ability (kung, or gong) gained through the practice
of Kung Fu and includes the methods to develop fundamental ability (ji ben
kung), aspects of softness (ruan kung) and hardness (ying kung), and the
cultivation of chi (chi kung), among others.