The research project evaluates the JIC in Zambia. The study randomly assigns 170 participating schools to five different JIC treatment arms. The first two arms represent control schools. Here, no JIC will be implemented. The third arm implements the JIC among a random subset of students. The fourth arm implements the JIC among indegree central students. The fifth arm implements the JIC among edge betweeness central students. In each school, the JIC will be implemented in one pre-determined grade. Within each school at least 30 students will be selected. For larger schools, 20 percent of students in the selected grade are selected.