Teaching in the multi-grade class is more difficult than mono-grade for teachers, however, multi-grade teaching was defined as the best strategy to achieving access to Education For All (EFA) of children especially those from rural areas. Teachers have been working diligently but unmethodical in their classroom. This study aimed to improve and enhance the teachers' professional skills which they have been facing in the classroom through the Lesson study and discuss why most of the teachers did not like to prepare and/or develop lesson plans. There were 100 participants who teach in the multi-grade schools in the Salavan district. The results represented that pre-test scores and post-test scores from two of training groups were significantly different and found that most of teachers do not usually prepare lesson plans. The research findings also determined that a Lesson study can be beneficial to enhance the development the teachers' professional skills.https://doi.org/10.26803/ijlter.17.4.5

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