Described is the kindergarten through eighth-grade science program of the Montgomery County Public Schools, Rockville, Maryland. This program places emphasis on biological science and physical science. Involved are activities selected from several sources, which emphasize the processes of science, the nature of science, and the substance of science. Emphasis is given to an activity-centered classroom, where the children learn through their own experiences with materials and investigations selected and designed to take advantage of their natural curiosity. The K-8 program is described with a listing of substantive topics, sources of materials and activities, and a short statement encorporating instructional objectives. (DS)