 These include the Young Child PTSD Screen, the Young Child PTSD Checklist, and the Diagnostic Infant and Preschool Assessment.Evidence-based assessment principles, including a multimethod assessment approach, form the foundation of PTSD assessment.PTSD was classified as an anxiety disorder in the "DSM-IV", but has since been reclassified as a "trauma- and stressor-related disorder" in the "DSM-5".