Knowledge in the field of humanities and social sciences: morals and ethics, jurisprudence, philosophy, literature, history, politics, art, sociology, anthropology, psychology, religion and culture which consists of policy, laws and regulations, industry and commerce, tax administration, finance, insurance, social interaction, and public relation etc. Knowledge of natural science: philosophy of science and the history of natural science etc. Knowledge of engineering technology: such as engineering design, machinery, electron, and textile engineering etc. This kind of knowledge is integrated knowledge, which is influential in making full use of social relation. It is the central layer of the pyramid.