Written Exposure Therapy shows effectiveness in routine care of PTSD. Written Exposure Therapy for PTSD (WET) was designed as a 5-session, trauma-focused treatment that does not require homework between sessions. The treatment involves writing detailed accounts of a traumatic experience and its impact; a preliminary VA study validates its usefulness. See VA’s Discussion:

https://www.ptsd.va.gov/publications/ctu_docs/ctu_v15n6.pdf