This paper presents an updated review of the empirical literature which examines multimodal forms of treatment for Attention Deficit Hyperactivity Disorder (ADHD). Multimodal treatment typically involves some combination of psychostimulant medication, behavior modification, and cognitive training. Results of studies were grouped into three categories: medication plus behavior modification, medication plus cognitive training, and other treatment combinations. Studies most often used clinical outpatient populations, and interventions were implemented by clinicians, parents, and/or teachers. Findings indicate that: (1) for many children, stimulant medication, along or in combination with behavior modification and/or cognitive training, appears to improve behavior at home and school and contribute to improvements in academic achievement; (2) behavior modification appears to be effective in improving children's behavior in the specific situations where it is utilized, but when combined with stimulant medication does not appear to add additional benefit beyond that offered by the medication; (3) cognitive training does not appear to significantly improve the behavior of ADHD children; and (4) for some children, combining a low does of stimulant medication with a behavior modification intervention appears to facilitate the same level of behavior improvement as a high does of stimulant medication alone. (Contains 38 references.) (CR)