The authors offer a framework for the assessment of psychological responses associated with exposure to early onset, multiple, or extended traumatic stressors. Six prominent and overlapping symptoms clusters are described: altered self-capacities, cognitive symptoms, mood disturbance, overdeveloped avoidance responses, somatoform distress, and posttraumatic stress. A strategy for the structured, psychometrically valid assessment of these outcomes is introduced, and specific recommendations for use of various generic and trauma-specific child and adult measures are provided. Implications of trauma assessment for treatment planning are discussed.Reactions to overwhelming psychological stressors can be viewed as residing on a complexity continuum. At one end are responses to adult-onset, single-incident, traumatic events (e.g., a motor vehicle accident, a mugging) that occur in individuals with adequate childhood development, a normoreactive nervous system, and no comorbid psychological disorders. At the opposite end are responses to early onset, multiple, extended, and sometimes highly invasive traumatic events, frequently of an interpersonal nature, often involving a significant amount of stigma or shame, that occur in individuals who, for a variety of reasons, may be more vulnerable to stress effects.Individuals at the high end of this complexity continuum are the subject of this article. These individuals are likely to experience a variety of posttraumatic symptoms and negative mood states, and often present with chronic affect regulation and interpersonal difficulties