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This survey research aims to study 1) the level of the Organizational Citizenship Behavior of government teachers, 2) the comparison of the Organizational Citizenship Behavior of government teachers classified by demography characteristic and 3) the guideline on the promotion of Organizational Citizenship Behavior of government teachers. The sample used in this research were 340 government teachers under the Office of the Secondary Educational Service Area 3, Nonthaburi Province collected through Stratified Random Sampling method specified by school sizes and 8 school administrators. The tools of this research were 5–points Likert scale questionnaire with reliability of 0.968 and the interview form. Data was analyzed and processed by statistical package program. Statistical processes used for data analysis were Mean, Standard Deviation, T-test, Analysis of Variance which specified the statistical significance value at 0.05 and Content Analysis.
The results of this research were found that 1) the overall aspects of the Organizational Citizenship Behavior of government teachers were found to be at high level, the highest one was compliance with rules and regulations of organization followed by organizational loyalty and cooperation respectively, 2) government teachers with different ages had the Organizational Citizenship Behavior on helping aspect in varied ways with the statistical significance value at 0.05, 3) government teachers with different sex, level of education and school size had the Organization Citizenship Behavior not different, 4) government teachers with different working experiences had the Organizational Citizenship Behavior on personal development aspect in varied ways with the statistical significance value at 0.05 and 5) the guideline on the promotion of Organizational Citizenship Behavior of government teachers consisted of the policies on professional development and on organizational culture building up.
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