The study's population is schools in the Choma and Livingstone provinces of Zambia (a final set of 170 schools). The schools were provided by the Zambian Ministry of Education. The schools are split between primary (grade 1 to 7) and secondary schools (grade 8 to 12). In order to not interfere with exam periods, the Ministry of General Education and GIZ decided to implement the JIC among children in grade 6 in primary schools, and grade 11 in secondary schools.