Progress during the first two years (1967-1968 and 1968-1969) of a three-year home-based, mother-child intervention program called the Verbal Interaction Project is described. The project was planned for the cognitive enrichment of preschoolers 2 to 4 years old, from lower income families. The program utilized specially trained home visitors, called Toy Demonstrators, who visited mother-child pairs twice weekly over two 7-month periods. The Toy Demonstrator presented the child with 28 toys and books, and stimulated verbally oriented play by acting as a model for the mother. The mother utilized the information in her interaction with the child to develop the potential for verbal interaction when they played with the toys and books. Results of the intervention method showed that it was an effective agent for cognitive and verbal growth in the program children. The design, subjects, procedures, materials, data management, findings, and summary of findings are presented. The text is illustrated with 19 tables. Proposed plans for the third year of the project are presented along with projection of future research. Appendixes present the four data cards that are utilized in the program. References are included. (DB)