An in vitro flooding package was used to treat the posttraumatic stress disorders of three children. Traumatic scenes were identified and stimulus-response imagery cues were provided according to a multiple baseline design. The outcome data revealed positive changes on the children's affective, behavioral, and cognitive parameters. The relevance of the flooding modality is considered from within the scope of the practical needs of school psychology.According to the American Psychiatric Association's (APA) Diagnostic and Statistical Manual of Mental Disorders (DSM-III; APA, 1980) posttraumatic stress disorders (PTSD) are precipitated by a distinct stressor that is "generally outside the range of usual human experience" and of sufficient intensity as to "invoke significant symptoms of distress from almost everyone" (p. 238). These symptoms are characterized by high levels of anxiety, unwanted recollections of the trauma, blunted affect, avoidance behaviors, and a number of disparate symptoms (e.g., concentration and memory impairment, survival guilt, and startle response). The DSM-IIIalso stipulates that symptoms of depression as well as "sporadic and unpredictable explosions of aggressive behavior" may be evident and that "the disorder can occur at any age including childhood" (APA, 1980, p. 237). Within this context, children have developed PTSD after being abducted (Terr, 1983), physically abused (Blank & Dicker son, 1982), attacked by animals (Gislason & Call, 1982), raped (Kilpatrick, Veronen, & Best, 1985), or exposed to nuclear accidents (Collins, Baum, & Singer, 1983).Examined from a behavioral paradigm, five single-case investigations used in vitro flooding (i.e., a behavioral treatment based on the principal of extinction and involving prolonged imaginal exposures to highly aversive stimuli) (O' Leary & Wilson, 1987) to treat circumscribed PTSD cases. Three of these reports (Fairbank, Gross, & Keane, 1983;Fairbank & Keane, 1982;Keane & Kaloupek, 1982) involved the treatment of American combat veterans. The fourth and fifth reports (Saigh, 1985a, in press) are more germane to the practice of school psychology inasmuch as they involved the treatment of traumatized students. Within this context, Saigh's reports used multiplecomponent behavioral assessments (i.e., behavioral avoidance tests, self-reported measures of anxiety and depression, and self-monitored frequencies of traumatic ideation) as well as measures of concentration and memory impairment to assess the varied symptomotology of PTSD before, during, and after in vitro flooding. The results clearly Requests for reprints should be sent to