Method: The sample consists of two different subsamples: 1) A hospital sample consisting of children and adolescents (school age: 7-18 years), who experienced an accidental trauma (either acute traffic accident or burn injury) assessed at three times: in the acute phase (7-14 days), 3 months, and 6 months after the trauma occurred. 2) An already existing clinical sample of 159 children and adolescents (TreatChildTrauma study), who mostly experienced an interpersonal trauma such as sexual or physical abuse. The total sample will be used to investigate the impact of child and environmental factors including trauma type, trauma frequency, age, gender, risk status pre trauma (psychopathological status pre trauma and traumatic events pre trauma), psychopathological status post trauma, and parental trauma-related cognitions. In addition, the hospital sample will be used for assessing the naturalistic time course of dysfunctional trauma-related cognitions as well as the association between cognitions, PTSS, depression, and anxiety over time. Moreover, the association between parental dysfunctional trauma-related cognitions and altered parenting as well as their impact on the child's cognitions will be investigated.