This study was to compare the significant differences in the teachers’ perceptions towards school’s professional development according to their gender, age, nationality, teaching experience and teaching level at aninternational school in Pracha Uthit, Bangkok, Thailand. Sixty-five teachers from the international school were surveyed by questionnaire based on Guskey’s (2000) Professional Development Evaluation model. The results showed that teachers’ perception level towards school’s professional development at ...