ABSTRACT This study examines the perspectives of Iranian EFL teachers regarding the effectiveness of lesson study in improving teaching practices and student achievement. Using a mix-method approach, A validated questionnaire was used to collect participants’ views on the effects, benefits, weaknesses, and future prospects of lesson study. The quantitative and qualitative findings reveal that while many participants believe that lesson study facilitates the development of deep, trusting relationships among teachers and strengthens their sense of collegiality, lesson study also influences their discussions about teaching and learning and transforms their attitudes towards student and peer interactions within the classroom. However, the study identifies a concerning trend where lesson study is perceived as a ‘luxury’, time-consuming, and lacking significance in terms of quality. This suggests a need for addressing these challenges to ensure the continued implementation and sustainable impact of lesson study in EFL teacher professional development in the Iranian context. Overall, this study sheds light on the complex dynamics surrounding lesson study in the Iranian EFL context and provides valuable insights for educational policymakers and practitioners seeking to harness the full potential of this professional development approach.
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