This report is a followup of an earlier study which attempted to assess the effectiveness of a Montessori program for preschool inner-city children. Data collected from the children over a 3-year followup period is analyzed, and the children's performance is compared with that of various control groups. There was some evidence that children in the Montessori preschool program had higher levels of intellectual functioning and school achievement which still persisted after several years. However, serious sampling problems limit the generality of the results. (Author/CS)