A model of continuing teacher professional development has been developed in four districts through institutional collaboration between the Indonesia University of Education and West Java Provincial Offi ce of Education since 2010. Best practices of the previous Lesson Study project under support of JICA at a piloting district have been adopted by making enhancements on several activities. Teachers were grouped into 16 to 32 working groups per district, depending on the number of teachers in one district so that members of one working group consists of 30 to 40 teachers per subject (Mathematics, Science, English, or Indonesian) for effective meeting. Teachers ? teacher educators meetings were held regularly at schools within a working group. Teachers and teacher educators worked collaboratively to research lessons for promoting active student learning utilizing available local materials based on learning resources. Principals, supervisors, and provincial and district education offi cers have been involved to build ownership of the programs and promote role sharing among concerned institutions for sustainability. Progress of the model development will be reported.