<qa>  What is the effect of a brief psychological intervention?Within a randomized controlled design the effects of a brief psychological intervention child, parents after a road traffic accident shall be examined in a sample of 100 children and adolescents. After a baseline assessment 7-10 days after the accident participants are randomly assigned to an intervention or a control group. Both are re-assessed at 2 and 6 months after the accident by means of standardized questionnaires assessing posttraumatic stress symptoms, depression, and behavior. 