| Summary: | The objectives of this research were to. - 1) create and test the effectiveness of online learning media according to the 80/80 criteria.2) to compare achievement
before and after using the developed online learning media 3) Investigate the learners’ satisfaction with the developed online learning media. The target group consisted of 28 students in the International Music Department selected
by choosing a specific method (Purposive Sapling). The tools used consisted of 1) learning media developed by 2) pre-school and post-study achievement measurements. 3) Learning management plans, and 4) a satisfaction survey form. The statistics used in the data analysis were mean, percentage, and standard deviation, E1/E2 efficiency index and t-test. The results showed that 1) An online learning media kit for International Music Theory 2 students in their first year of Vocational Certificate at Roi Et College of Dramatic Arts Bunditpatanasilpa Institute hadan efficiency of 81.43/87.39 which is higher than the set standard. 2) For assessment of pre-and post-study achievements using online learning media kits before school, the average was 80.59; after school, the average was 87.39, significantly higher than the statistical threshold at the.01 level. 3) The students’ satisfaction with the online learning media package overall was at a very high level, with an average of 4.49.
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