Second, the authors suggested that dissociative symptoms be "an associated, but not required, feature of acute PTSD" (p. 1683). Yet their argument that dissociative symptoms are a less than perfect predictor of PTSD and therefore should be dropped from acute stress disorder is tautological. Dissociative symptoms are only a minor component of the current DSM-IV PTSD criteria, as are amnesia and numbness. It is axiomatic that predictive power is greatest when one is assessing the same symptom at baseline and follow-up. Thus, it is remarkable that dissociation in the acute phase predicts later PTSD as well as it does (Brewin et al., 1999). If anything, the problem may be that PTSD needs redefinition. In fact, some studies have shown that dissociative symptoms (1, 4, 6) and acute stress disorder (Brewin et al., 1999) are better predictors of long-term PTSD than are acute intrusion and hyperarousal symptoms themselves.