This forth annual report covers the activities of the Research and Development Center in Educational Stimulation during the 1968-69 fiscal year. To reflect the Center's new programmatic structure, the description of the Center's objectives and activities is organized as follows: (1) Administrative program; (2) substantive programs, including art, language arts and verbal learning, mathematics, music, physical education, science, and social science; (3) developmental psychology program; (4) evaluation program; and (5) technical support program, including statistical services, publications, dissemination, and field centers. It is anticipated that this new organizational structure will increase the Center's capability to attain its primary goal of developing a system which will provide early and continuous educational stimulation through structured sequential learning activities beginning with children aged 3 years. The appendix contains a 286-item bibliography of literature related to the Center's activities. (JH)