The four-level model of training effect evaluation refers to the evaluation of training effect from four levels: reaction, learning, behavior and result.

The first layer is the reaction layer, which mainly focuses on students' satisfaction and feelings about the training. This includes the evaluation of trainers, training contents, training methods and training facilities. By understanding the students' reaction, we can judge whether the training meets the needs and expectations of the students and provide reference for improving the training.

The second layer is the learning layer, which mainly focuses on students' gains in knowledge, skills and attitudes. This can be evaluated through exams, questionnaires and practical operations. By understanding the students' learning situation, we can judge whether the training has achieved the expected learning effect and provide a basis for improving the training quality.

The third layer is the behavior layer, which mainly focuses on whether students can apply the knowledge and skills they have learned in their work. This can be evaluated through observation and performance evaluation. By understanding the behavior changes of the trainees, we can judge whether the training has a positive impact on the trainees' job performance and provide feedback for the practicality and pertinence of the training.

The fourth layer is the result layer, which mainly focuses on the influence of training on organizational performance. This can be evaluated through the analysis of organizational performance indicators, employee turnover rate and customer satisfaction. By understanding the changes of organizational results, we can judge whether the training has promoted the development of the organization and provide guidance for making a more reasonable training plan.

To sum up, the four-level model of training effect evaluation is a systematic evaluation method, which evaluates the training effect from different angles and provides comprehensive feedback and guidance for improving the training quality and effect.