This research aimed to obtain the description concerning participants, superintendent, materials, activities, and facilities/infrastructure on the effectiveness of the management of Kelompok Kerja Guru (KKG)/Teacher Working Group activities in UPT Dinas Pendidikan (Sub-district Education Office) of Rembang Sub-district, Purbalingga. The data were collected by using questionnaires distributed to 303 respondents. The questionnaires involved questions participants, coaches, materials, activities, and facilities /infrastructure on the effectiveness of the management of KKG activities in UPT Dinas Pendidikan Rembang Sub-district, Purbalingga. The analysis instruments adopted comprised instrument test (validitity, and reliability) analisis deskriptif kuantitatif. Based on the analysis, it could be concluded that the component of participants is 96% very effective, 4% effective. Component of superintendent is 81.8% very effective, and 18.2% effective. The component of materials is 80,5 very effective, 19.5% effective. The component of activities is 96.7% very effective, 3.3% effective. The component of facilities/infrastructure is 90.8%, and 9.2% effective