The treatment of Katrina, a chronically depressed 25-year-old female who pr
esented with a comorbid PTSD disorder, is discussed. The cognitive behavior
al analysis system of psychotherapy (CBASP, McCullough, 2000) is used to tr
eat the Psychopathology. Inhibiting the patient's tendency to leave therapy
prematurely constitutes the first task of therapy. The next phase Of treat
ment illustrates how the PTSD symptoms will be addressed. The final stage o
f treatment explains how the clinician will treat the chronic depressive di
sorder. The patient will remain on anxiolytic and antidepressant medication
throughout.