摘要:AbstractOrganizational citizenship behavior (OCB) is very important to teachers and schools because it is related to school effectiveness. This study tried to create a multidimensional item response model of teachers’ OCB and develop a teachers’ OCB scale using a new synthesized model. The scale was developed and pre-tested by 604 elementary and middle school teachers under the Office of the Basic Education Commissionof Thailand. The item total correlation and the Cronbach alpha coefficient analysis of data appeared discrimination ability and reliability. In addition, the multidimensional analysis and the confirmatory factor analysis of data showed item fit and construct validity of the scale. This may lead to the development of clear and correct measure of teachers’ OCB structure.