A program of science activities for children in the early childhood years and their parents is offered. The three different formats of the Playtime Is Science program are adaptable to a variety of settings and schedules. The Parent/Child Activity Program includes one parents-only session in which participants learn that routine chores involve physical science concepts they can share with their children. During the remaining four sessions, children are given 45 minutes to learn activities. Parents act as facilitators in the activities. In the second version of the program, Parents as Teachers, parents work not only with their own children, but also with their children's classmates. The third version, Super Science Saturday, gives parents a chance to use the program on weekends. The five core activities of the program involve physical science experiences with materials commonly found in the home. Activities include making and using sieves, creating a "mystery bottle," making and tossing bean bags, building with "wonderful junk," and discovering how machines work. Sections of the guide provide directions, a program overview, a resource list of appropriate picture and activity books, and step-by-step activity sheets. (RH)