From the International Society for Traumatic Stress Studies: “The CATS is based on the DSM-5 and is a measure of potentially traumatic events and of posttraumatic stress symptoms (PTSS). The CATS can be administered as a self-report or as an interview and is appropriate for pre-schoolers, children and adolescents. There is a self-report measure for 7-17 year old children/youth, and two caregiver versions; one for 3-6 year old children and one for 7-17 year old children/youth. The younger child version conforms to the DSM-5 3-6 year old PTSD symptom criteria. The interview format may be preferable with younger children or youth with reading comprehension challenges.”