An intervention study with mothers and infants is discussed. The project staff consisted of two home visitors, a materials specialist, an infant examiner, and a project coordinator. This study assessed the effectiveness of the program for mothers and infants. Infant abilities and psychological development were tested and homes were rated. One home visitor worked directly in each home for a maximum of 24 home visits. Throughout the project, the home visitor demonstrated and reinforced behavior of the adult caretaker that provides for the physical, emotional, social, and intellectual development of infants. Data analysis indicated that a successful intervention program can be designed to affect favorably a wide range of functional areas in the behavioral development of infants. (Author/CK)