You can actually find the methodology in our research, which is available online. All of our research and 95% of our teacher, parent, and youth resources are available for free on our website online, so I won't go into it in too much detail.
Essentially it was conducted in classrooms. It was a survey. For consistency, we go as much as possible back to the same schools each time we do an iteration of this survey. We took every step possible to guarantee anonymity to the students, so they wouldn't have to worry about being associated with the data. Beyond that, it was a simple questionnaire.