The attending behavior of a group of developmentally handicapped preschool children was quantified for the purpose of comparing on-task attending in a group with on-task attending in the one-to-one occupational therapy setting. A replicated single subject crossover design was used in which eight study subjects were divided into two groups. The first group (A-B-A) received seven sessions of fine motor developmental stimulation in an individualized setting, then seven sessions in a groups setting, then again seven sessions in a one-to-one setting. In the second group (B-A-B), the order was reversed. All children attended a greater proportion of time in the individual setting; however, the magnitude of the differences between the two settings was small for some children. In terms of attending behavior, therefore, the group treatment setting may be appropriate for some children and merits consideration in view of the cost of a therapist's time.