A research project attempted to discover whether residence in the Tremont Day Care Street Infant Center for 27 months had any significant effect on the cognitive, social and affective development of infants. Children entered this multilingual day care setting at 3 1/2 months and were from Chinese-speaking, Spanish-speaking, or English-speaking homes. Three matched groups of children received different treatments: (1) 28 attended the Tremont Street center, (2) 28 were raised at home, and (3) 10 were in custodial day care programs. Preliminary research results are discussed in this progress report. Interpretation is largely concerned with maturational processes that appear to significantly affect the child's reactions to change in habituated events. Most of the report is concerned with assessment and data analysis, although some logistical issues are reviewed. (MS)