This research aimed to study and compare the behavior of self-development through the principle of four Bhãvanã-s for youth at Takhan District, Bankhai, Rayong province, before and after using training program to adjust the self-development, classified by personal factors. This study was a quasi-experimental research. The samples were 54 students of youth student in secondary Wiboonwithaya School. The tool used in this research were questionnaire and training program to adjust the self-development though the principle of four Bhãvanã-s. The statistics used for data analysis were Percentage, Mean, Standard deviation, t-test, F-test, and test the differences between pairs by least significant difference (LSD).

The results have presented as follows:

1)      Before attending the principle of four Bhãvanã-s activities, youth student at Takhan District Bankhai Rayong province had self-development at moderate level.

2)      After attending the principle of four Bhãvanã-s activities, youth student at Takhan District Bankhai Rayong province had self-development at high level.

3)      The comparison of self-development through the principle of four Bhãvanã-s at Takhan District Bankhai Rayong province, before and after attending the principle of four Bhãvanã-s activities, youth student had self-development by overall increased as statistical significance at the 0.05 level.

4)      After attending the principle of four Bhãvanã-s activities, youth student at Takhan District Bankhai Rayong province, with different gender were increased with difference of 0.05 significance.

5)      After attending the principle of four Bhãvanã-s activities, youth student at Takhan District Bankhai Rayong province, with different age were increased with difference of 0.05 significance.

6)      After attending the principle of four Bhãvanã-s activities, youth student at Takhan District Bankhai Rayong province, with different parental careers were increased without difference of 0.05 significantly.

7)      After attending the principle of four Bhãvanã-s activities, youth student at Takhan District Bankhai Rayong province, with different status family were increased with difference of 0.05 significance.

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