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In this study, we aim to gain critical insights into how cooperative professional development affects teachers' efficacy. To this end, the purpose of this study is to identify cooperative professional development types (CPD-type) and to reveal the relationship between CPD-type and teachers' efficacy in Korean middle schools, controlling for gender, age, years of experience and school climate. The data of this study are derived from the 2013 Teaching and Learning International Survey (TALIS)doi:10.3390/su11030585 fatcat:lw35eevm5jd4vat7yrjwwxyb5i