This study aimed to create an educational innovation called "Online Self-Training Program for Empowering Teachers' Learning to Strengthen Students' Teamwork Skills" conducted with Research and Development (R&D) to be effective according to specified criteria. It can be broadly applied to the development of teachers and students in target schools in research publications. This online self-training program consists of 2 projects that are continuously operated as follows: 1) a teacher development project involving the use of 7 self-training modules for teachers' learning, and 2) applying learning outcomes to a student development project, with 1 self-training module to be used as a guideline for teachers. The findings of the first online self-training program revealed that twelve teachers in the experimental group achieved 90/90 post-test scores, which were significantly higher than the pre-test scores. Furthermore, the results of the second project revealed that 300 students in the target group obtained statistically significantly higher post-test scores than pre-test scores. The findings are therefore consistent with the hypotheses. It illustrates that the educational innovation, "Online Self-Training Program for Empowering Teachers' Learning to Strengthen Students' Teamwork Skills", is effective and meets the specified criteria. It can also be disseminated for teacher and student development in the target schools. 1-11