The original Pediatric Symptom Checklist (PSC) is a 35-item parent completed questionnaire that assesses a broad range of emotional and behavioral problems in children. The PSC is used as a screen for psychosocial problems in pediatric well child visits, school enrollment, and entry into other systems of care for children from 4 to 18 years of age. With repeat administrations it is also used to assess changes in functioning over time. It has been validated for use with a wide range of pediatric and community populations in more than 200 studies over the past 30 years. The PSC is the recommended or required screen in several state Medicaid health insurance programs and in a national school mental health program in Chile. A briefer version (PSC-17) and a youth self-report version (PSC-Y) have also been validated as have translations into two dozen languages.