The 25-item Behavior and Symptom Identification Scale for the Adolescent Population, BASIS-Teen®, is behavioral health assessment tool designed to assess the outcome of mental health or substance abuse treatment from the adolescents perspective. Typically, BASIS-Teen® is given at admission and discharge for inpatient or residential programs, and at intake/initiation of treatment and then periodically thereafter in partial hospital or ambulatory/outpatient care settings. Grounded in the latest scientific methods of survey development and validation, the BASIS-Teen® underwent extensive testing as part of a multiyear research and development process.

BASIS-Teen® inquires as to the degree or frequency of difficulty that the adolescent respondent has been experiencing during the past week. The 25 items are scored using a weighted average algorithm that gives an overall score as well as scores for six subscales. The 25 items assess six major areas of difficulty and/or distress including: Attention/Anxiety, Suicidal Ideation/Depression, Self-Esteem, Substance Use, and Mood Dysregulation.

BASIS-Teen® is designed for use by mental health providers, researchers, purchasers of mental health services, accreditation agencies, and internal quality assurance departments to measure the change in consumer self-reported symptom and problem difficulty over the course of treatment. BASIS-Teen® is not diagnosis-specific, but was designed to cut across diagnoses, acknowledging the wide range of symptoms and problems that occur across the diagnostic spectrum.