This article describes the development of madrasah through trust-building at MI Ma'arif NU Teluk Purwokerto Selatan. Like one of the Islamic educational institutions in Indonesia, Madrasah has a strategic role in achieving national education goals. In its development, especially Madrasah Ibtidaiyyah, the quantity of private madrasah is higher than that of the public madrasah. It impacts the madrasah's existence, which will depend heavily on the community as the primary stakeholder and madrasah as a concrete form of community-based education. For this reason, it is necessary to have active community participation in developing competitive and quality madrasah, among others, through building trust. This research is qualitative-descriptive with a case study approach—data collection techniques using interviews, observation, and documentation. The results indicated that the development of MI Ma'arif NU Teluk through trust-building was used in several stages, namely through the development of the character of figures who were able to become role models for the community. The belief formed by these figures will stick in a person's memory and become a role model in his life. Trust building is also built through improving the quality of the madrasah, namely the madrasah program. The madrasah program is an effective means of creating external trust in madrasah. The madrasah program is in the national curriculum and the local content curriculum, simultaneously implemented at MI Ma'arif NU Teluk.

The purpose of this research is to describe the study of social capital as capital for madrasa in development of their institutions. Madrasa is an educational institution labeled as Islamic which initially did not immediately receive  public attention. Many attempts have been made to obtain the legality of recognition of its existence. In addition, madrasa are educational institutions that have a close image with community contributions in the sense that madrasa cannot be separated from society. This contribution is an important asset for the survival and existence of madrasa. Madrasa in its development involves the community as the center of the progress of the institution. This community contribution is a social capital that can improve the quality of madrasa through their role and support. In the study of social capital, there are three main elements, namely trust, value and network. The three of them are related to each other and form a bond as an asset in developing madrasa. Madrasa and communities establish close relationships as a strategic step in improving the quality of educational institutions. Therefore it is necessary to have a harmonious relationship between madrasa and society so that common goals can be achieved.