Teenagers face some serious issues: drugs, bullying, sexual violence, depression, gangs. They don't always like to talk about these things with adults.
One way that researchers and educators can get around that is to give teens a survey — a simple, anonymous questionnaire they can fill out by themselves without any grown-ups hovering over them. Hundreds of thousands of students take such surveys every year. School districts use them to gather data; so do the federal government, states and independent researchers.