Randomization
We randomized at the school level to avoid contamination in the control group. The randomization, stratified by school type, was used to assign schools to the intervention or the control group. At each round, VET schools were divided into the following strata: (1) social and healthcare, (2) commercial, and (3) technical. In the second round, a fourth stratum with PBE schools was added. A statistician not involved in the study performed randomization within each stratum and informed the project leader (SA). The project team informed schools by e-mail and visited the intervention schools to plan and support implementation.