To examine the relative effectiveness of in-class versus out-of-class PT/OT preschool service delivery models, the investigators randomly assigned 61 preschool children (28 with motor delays and 33 without motor delays) to the two conditions. The Battelle Developmental Scales and the McCarthy Scales of Children's Abilities were administered pre- and post-test. Classroom staff were also administered a questionnaire to evaluate their perceptions of the relative effectiveness of two models. No significant differences were found between groups for students with motor delays, although a trend favoring the in-class condition was noted. One significant difference favoring the out-of-class condition was found for children without motor delays on the gross motor subtest of the Battelle. The questionnaire results overall, however, indicated a preference for the in-class service model. A rationale for the trends is discussed, as well as future research needs.