The quality of nuclear power plant (NPP) personnel training is strongly dependent upon the availability of competent instructors. This book is published as a follow-up to Technical Reports Series No. 380, Nuclear Power Plant Personnel Training and its Evaluation, A Guidebook, to provide further details concerning the development of instructors for NPP personnel training. This publication has been developed and published to provide practical guidance on various aspects of instructor selection, development and deployment, by quoting actual examples from various countries and operating organizations.