The Ontario Institute for Studies in Education and the Canadian Mothercraft Society are running a day care program for infants (from 3 to 30 months of age) designed to facilitate their cognitive, personality, and social development through personalized adult-child interaction, guided learning situations, free play, and specialized care. Collaboration with the home is extensive. This document reports uncompleted but encouraging midyear program results. A sample of inner city disadvantaged children and two samples of middle class children were tested twice each on the Bayley Mental Scale and the Stanford-Binet IQ Test. The five disadvantaged children were, on the average, 4.9 months old when they entered the program and had their first testing. Their second testing, 8 months later, showed a highly significant gain. The first group of advantaged children (N=6) was tested at an average age of 21.6 months, after 2 months in the program, and again 8 months later. The gain score for this group was inconsequential. The other group of middle class children (N=7) was tested at an average age of 11.4 months, after 2 months in the program, and again 6 months later. This group was tested again at an average of 26.7 months and their gain score was highly significant. The difference between the advantaged groups was attributed to time spent in the program. (MH)