Development of a Transdiagnostic Intervention for Adolescents at Risk for Serious Mental Illness

This study is developing and testing a mental health intervention for teenagers who are showing early warning signs that could indicate risk for serious mental illness, including psychosis. The goal is to provide support before problems become more severe. **You may be eligible if...** - You are currently in 9th through 12th grade and between 14 and 19 years old - You have reported at least one unusual perceptual or thought experience (such as hearing or seeing things others don't, or feeling like someone is out to get you) - You have a parent or guardian who can provide written consent if you are under 18 - You have provided your contact information to the research team **You may NOT be eligible if...** - You are not in high school or are outside the age range - You have already been diagnosed with a psychotic disorder - You are unable to participate in the intervention or follow-up assessments - A parent or guardian is unavailable to give consent (if under 18) Talk to your doctor to see if this trial is right for you.