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The objective of this research is to develop training package of coaching technique : on the job training for Supervisor in Establishment. The researcher has used the constructed training package to test the purposive sampling group of 15 people who are the supervisor in Somboon Advance Technology Public Company Limited Before conduct training, the pretest was provided to the testing group or trainees for testing pre-knowledge. During the training program, trainees did their exercise to evaluate the training programs. After the training completion, the post test was provided to the trainees to evaluate their achievements. The exercises score and posttest was calculated in order to measure the effectiveness of the training package. The result of evaluation shows that the training package has the effectiveness of 83.05