The major aim of this project is to evaluate an abbreviated format of SIT that aims to provide effective self/stress-management skills to individuals with PTSD. The rationale behind this intervention is that with appropriate and intensive therapist input during a single session of therapy, supplemented systematically with self-paced and self-directed homework, promoted, prompted, and monitored via a specialized web-site and augmented by therapist feedback and guidance delivered via the web, primary care patients with PTSD stemming from mass violence can benefit from the strategies that have demonstrated efficacy in reducing PTSD symptoms. Survivors of the Pentagon attack on 9/11 who present at primary care clinics that serve the Pengaton are randomly assigned to SIT or a supportive counseling control group. Patients’ compliance and symptoms are monitored on the web and via clinical interview.