The rehabilitation of intellectual impairment resulting from brain injury has become a major professional activity of clinical neuropsychologists. In recent years, neuropsychology has developed from a professional role stressing assessment and diagnosis to one that now includes treatment and rehabilitation activities. Such trends are also manifested in two new research interests of neuropsychologists: the study of the generalizability of neuropsychological test findings to everyday abilities, often referred to as the "ecological validity" of tests, and outcome studies of cognitive retraining...