The research aimed 1) to investigate components and indicators of the leadership competencies of secondary school teachers, 2) to explore the existing situations and desirable situations of secondary school teachers' leadership competencies, 3) to study the techniques to strengthen teachers' leadership competencies, 4) to develop the teacher-leadership competencies strengthening program, and 5) to find out the results of implementing the program to improve the teacher's leadership competencies.

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... Research and development was employed, divided into five phases as follows: Phase 1 examined the components and indicators of the teacher's leadership competencies and was verified by 10 experts ; Phase 2 explored the existing situations and desirable situations of the teacher's leadership competencies by using a questionnaire to collect data from the samples of 1,008 secondary school teachers ; Phase 3 examined the appropriate techniques to enhance the teacher's leadership competencies from the same samples of phase 2 ; Phase 4 developed a program to strengthen the leadership competencies of secondary school teachers and verified program by 7 experts, and Phase 5 evaluated the results of implementing the teacher's leadership competencies enhancement program and collected data from 50 secondary school teachers. The research results were: 1) Secondary school teachers' leadership competencies comprised four aspects and fifty indicators. 2) The existing situations of the teacher's leadership competencies under the Office of the Secondary Educational Service Areas were found to be at a high level and the desirable situations were found to be at the highest level. 3) The teacher's needs to enhance leadership competencies were continuous study, training and practice, educational trips, training, mentorship, job training, brain storming, group meetings, and seminars. 4) The teacher's leadership competencies enhancement program consisted of four modules: self-development, instructional development, providing advice and assistance to colleagues and cooperation in a development. 5) The teacher's leadership competencies after their undergoing the enhancement program were found to be at a maximum level and the teachers were satisfied about the leadership enhancement program at a very high level.