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Understanding of posttraumatic stress disorder (PTSD) has increased substantially in the past several decades. There is now more awareness of the many different types of trauma that can lead to PTSD, greater refinement of diagnostic criteria, and the development and testing of various treatments for it. As implementation of PTSD therapies has increased, there is also increased attention to the key issues of retention and dropout. Retention refers to the percentage of patients who stay in a treatment for its intended dose, and dropout is the opposite (the percentage who leave prior to the intended dose); both of which have major implications for treatment outcomes. The two PTSD therapies most studied in relation to retention and dropout are Prolonged Exposure and Cognitive Processing Therapy, which have been the subject of massive, formal, multi-year dissemination roll-outs. Both of these evidence-based …