Results confirm previous findings that the revised State University of New York at Stony Brook observation code is a valid instrument for quantifying and discriminating the classroom behavior of children referred because of hyperactive behavior. (Author)

Devised a classroom observation code that would identify hyperactive children reliably. Children referred for hyperactivity had significantly higher scores than comparison children on 12 categories. There was greater within-subject variability in the hyperactive group. Motor activity for both groups was significantly inversely related to age.…