The research entitled “The Yonisomanasikara Approach of Buddhist Subject for Secondary School Titled Wat Maechoei, Uttaradit Province”. This was the experienced research in the model as the one group pretest/posttest design. Its objectives were (1) to study the teaching the Yonisomanasikara Approach in the Secondary School Named Wat Maechoei, Uttaradit Province and (2) to compare it before and after learning on this topic as the Buddhist’s Holy Days. The data was collected by the test forms. Its analysis was used by the computer program with the software. It was the descriptive statistics that was the means, the standard deviation and the inferential statistics, because the score comparison of the test before and after by analyzing the difference of the paired sample t-test

Findings were as follows:

1. The teaching the Yonisomanasikara Approach in the Secondary School Named Wat Maechoei, Uttaradit Province was interesting to students who could reasonably study together with the group and the small groups, present, make the questions, and share the knowledge each other according to the Yonisomanasikara Approach.

2. The learning achievement was after learning the higher score than before it and it the statistic significant difference at the level 0.01 in this school of students who learnt the first learning plan on Maghapuja Day, the second learning plan on Vesakhapuja Day, the third learning plan on Asalhapuja Day, the fourth learning plan on Buddhist Lent Day and the fifth learning plan on End of Buddhist Lent Day. 

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