6.2.5 The laboratory shall have procedure(s) and maintain records for: a) determining the competence requirements; b) selection of personnel; c) training of personnel; d) supervision of personnel; e) authorization of personnel; f) monitoring of competence of personnel. 以上是新版17025的条款,怎么理解f)人员能力的监控,和d)的区别是什么呢?