“…In this manner, it can be said that using lesson study nationally and in other courses could contributes to both teachers' in-service professional development and students' learning. According to related literature, there are a lot of research about lesson study contributions to students' achievement especially in English and mathematics courses (Boran & Tarım, 2016;Coşkun, 2017;Kıncal & Beypınar, 2015;Koçak et al, 2018;Nashruddin & Nurrachman, 2016;Saito et al, 2015). The results of the study about teachers' views about lesson study are parallel to international and national studies' results (Boran & Tarım, 2016;Bozkuş et al, 2017;Cheung & Wong, 2014;Gonzalez & Deal, 2017;Günay, Yücel-Toy, & Bahadır, 2016;Howell & Saye, 2016).…”