As required by state law, local governments are implementing teacher qualification systems and promoting in-service training for large numbers of school principals, so as to further improve school management standards. Currently, in schools of higher learning, professors and assistant professors account for 9.5 percent and 30 percent respectively. Young and middle-aged teachers predominate; teachers under age 45 account for 79 percent of total faculty, and under age 35 for 46 percent. Teachers in higher education constitute a vital contingent in scientific research, knowledge innovation, and sci-tech. Of all academicians in the Chinese Academy of Sciences, 40.7 percent (280) are in the higher education sector; for the Chinese Academy of Engineering the corresponding figure is 35.3 percent (234).