A followup study of 151 lower socioeconomic class children (under 6 years of age at the time of initial screening) was conducted to determine the effectiveness of the Denver Developmental Screening Test (DDST) in predicting school achievement problems. Ss were originally categorized into three age groups (0-2 years, 2-4 years, and 4-6 years) and three DDST classifications (normal, questionable, and abnormal). Followup evaluation (which took place when Ss' school placement ranged from beginning kindergarten to grade 5) included the following: achievement test percentiles, grade placement or special education status, and teacher ratings on the School Behavior Check List. Based on the above data, Ss were classified as having school problems if they met one or more of four criteria (which included achievement test percentiles of ten or less). Results indicated that the majority of Ss categorized as non-normal had later school problems and that prediction became more accurate with increasing age of screening in abnormals. (SB)