This study aims to determine the effect of government policy, school principal leadership, and parental participation on the strengthening of KKG/MGMP teacher organizations and developing students' problem solving abilities. This paper is part of a field study on KKG (elementary school) and MGMP (Junior/senior high school) in DKI Jakarta, Indonesia, with a total sample of 120 teachers. Data collection was carried out using questionnaire techniques, interviews, and conducting focus group discussions (FGD). The distribution of questionnaires to test the relationship between variables was analyzed with the help of the LISREL 8.80 program. The results showed that the three exogenous latent variables had a positive influence on the endogenous latent variables in the strengthening of the KKG/MGMP teacher organization, reinforcing that the teacher organization had a positive influence in developing students' problem solving ability. The influence of parental participation had a considerable effect and it made an important contribution in supporting teachers to participate in KKG/MGMP activities. It is recommended that the government revoke the regulations on prohibiting schools from collecting funding from parents, in order to let the school design school improvement programs with strict supervision and control to prevent deviations.