We would like to invite executives, lecturers, school directors, teachers, students and those interested to join the 17th National Open Class on March 23-24, 2024 at the Institute for Research and Development of Teaching Profession for ASEAN, Building 2, Khon Kaen University and in a hybrid format by the Institute for Research and Development of Teaching Profession for ASEAN in collaboration with the Education and Academic Services Division, Mathematics Education Research Center, Khon Kaen University, the Foundation for Education for the Development of Thinking Skills, the Mathematics Education Association, the Center of Excellence in Mathematics and the Buddharaksa Foundation. The 17th National Open Class is scheduled to be held on March 23-24, 2024 at the Institute for Research and Development of Teaching Profession for ASEAN, Building 2, Khon Kaen University and in a hybrid format via https://www.openclassthailand.com. The 17th National Open Class has been held continuously to disseminate the results of the implementation of classroom education innovations using open methods (Thailand lesson