This paper found the characteristics of environmental settings of Non-formal schools in Nairobi slum as follows:
1) They tend to move from rental-houses to their own properties.
2) In ‘congested area’, they layout classrooms scattered in the community. While in ‘not-congested area’, they layout them from the corner of compound to protect from ‘land-grabbing’.
3) Many of them don't own latrines, playgrounds and don't serve lunch. They supplemented these functions by using community resources, such as rental-latrines, open-lands and children's houses. Because of this, children spend break-time outside, and this makes children's activities more diversity and produces more demands for neighboring shops.