Abstract

• The main purpose of this study was to verify the structural construct validity which is called factor analysis of Teachers' Perception on Continuing Professional Development (CPD) Questionnaire. For Teachers' Perception on CPD Questionnaire, four instruments were used with 87 items. This questionnaire included four subscales such as updating activities, reflective activities, collaborative activities and benefits of attending CPD activities. There were altogether 87 items. The total of 1391 teachers from Mon State, Nay Pyi Taw Region and Magway Region were examined. After exploratory factor analysis (EFA), 37 items were left and 50 items were removed. After confirmatory factor analysis (CFA), next 6 items were removed and so only 31 items remained. Moreover, both convergent and discriminant validity was also accepted. In order to obtain the information which items are appropriate for teachers, an IRT parameter estimation procedure was carried out with two parameter logistic model (2 PLM) by utilizing BILOG-MG 3 software. It was observed that the test is discriminating well among examinees with the range of ability level -3 to +1.5 appropriately. The maximum amount of information was I (ө) = 19.5 is at ө = -1. Therefore, it was concluded that this test composed of 31 items could be suitable for teachers whose ability level range is – 1.