Three responsibilities of a trainer: 1. Training planning and organization: assist the training management to investigate the training needs, participate in the formulation of specific training plans, implementation plans and implementation plans, assist the training organization and operation, and ensure that the training plan meets the training needs and is implemented smoothly. 2. Teaching and effect evaluation of training: according to the results of demand survey, determine the project design outline, design the course structure, determine the course content, prepare course handouts and manuals, participate in training and teaching, do a good job of on-site control, evaluate the course effect according to the model of Korotkov Level 4 training evaluation, and constantly improve the training course according to feedback. 3. Training resource management: according to the training needs of enterprises, under the guidance of training management, collect and evaluate relevant courses and learning materials, develop and maintain appropriate learning and training channels, and ensure the richness and applicability of training resources.