This study explored the ability of Systematically Progressive Assessment (SPA), a multiple gating approach for assessing students with attention-deficit/hyperactivity disorder (ADHD), to discriminate between subtypes of ADHD. A total of 48 students with ADHD (ages 6-11) were evaluated with three "gates" of assessment. Logistic regression analysis was used to examine the predictive utility of measures within each gate to accurately classify students with the appropriate subtype of ADHD (inattentive or hyperactive-impulsive/combined). Preliminary results indicate that children with ADHD can be classified with the appropriate subtype, on the basis of parents' and observers' ratings of student behavior, with 88% accuracy.