Surveying the lower secondary teachers, who are directly involved in the program, the research firstly aimed at investigating the reality of English teacher’s professional development activities in Thai Nguyen City. Secondly, their improvement in professional development through using lesson study and find out the effectiveness of this method. Thirdly, the researcher explores teachers’ attitude towards using lesson study in professional development. Based on the findings, recommendations are made to promote teacher’s proficiency and improve the implementation of this method. |