Program for Alleviating and Resolving Trauma and Stress (PARTS) Pilot Study 1

This single-arm pilot study (Stage 1 Behavioral Therapy Development Project) will test the preliminary efficacy of a virtually delivered, live-online 16-week group model of Internal Family Systems (IFS) for individuals with PTSD, called the PARTS program, on PTSD symptoms measured by Clinician-Administered PTSD Scale (CAPS-5). In addition, feasibility, acceptability, and effects on self-report PTSD and disturbances of self-organization (DSO) will be secondary outcomes.