OTP model, also called "three-step system", was put forward by McGehee and Thayer in 196 1. They believe that the analysis of training needs should be systematic, and only by comprehensive analysis from three levels: organization, task and personnel can the training needs be objectively and accurately identified.

OTP mode was put forward by McGehee and Thayer in 196 1 Business and Industry Training. They believe that the determination of training needs cannot rely on subjective analysis, and only by comprehensive analysis from three levels: organization, task and personnel can training needs be identified systematically, objectively and accurately.

Among them, organizational analysis identifies the problems, opportunities and challenges in organizational development by analyzing the development strategy, resources and environment of the organization, so as to determine whether it is necessary and appropriate to adopt training to promote the realization of organizational goals.