Essentially, lesson study is a continuing professional development model supporting close collaboration between teachers and more knowledgeable others to improve teachers’ instructional knowledge and classroom practices. The LS4VET project thus aims to design and deliver an innovative methodology for VET teachers’ and trainers’ development by adapting the Japanese model of lesson study as a participatory action research generated by groups of teachers in VET schools. For more information about the project, please access the website https://ls4vet.itstudy.hu/