Supply side constraints may be the following: there are no schools within reasonable distance, there are no affordable schools, the quality of the schools is insufficient to go through the effort of sending the children to school (there are no teachers, no textbooks, teachers are not qualified/not paid), there are no appropriate schools (schools are dangerous for girls, there is no proper sanitation for girls, there are no female teachers). Demand side constraints could be: parents do not think that attending school is important for (all, girls, older) children, parents need the economic input of the children, and parents need the input of the children in household tasks. Social constraints that could be considered are e.g. families belonging to an ethnic, religious group, caste, political group that is discriminated against, or all boys are expected to go to the army at a young age. The starting point is that children should not only be seen as potential school children, but as children whose well-being depends on multiple aspects at the same time.