Teachers and caregivers understand well how important their role is in the promotion of young children's cognitive development. However, they must also emphasize the development of prosocial behaviors in children, particularly in light of some recent data indicating possible heightened aggression and lack of prosocial interactions among preschoolers who were in full-time non-maternal care during the first year of life. This paper describes for educators and parents specific ideas and skills to promote prosocial interactions in the classroom and harmonious family interactions. Following a brief review of research indicating the success of cognitive curricula in early education and the need for prosocial curricula, the paper briefly describes 30 classroom techniques to teach and encourage prosocial behavior. Techniques described include teaching children easy words to express feelings; giving clear, reasonable rules; teaching cooperative games; and encouraging more complex, positive sociodramatic play. Contains 20 references. (EV)