The purpose of this study was to examine the impact of a buddy skills package on the social and play interactions between three preschoolers with developmental delays and their peers. Each child participated in sociodramatic play activities with two peers who exhibited age-appropriate social and play skills. Following baseline, the children participated in three sessions of training on the strategies of stay, play, and talk with your friends. The intervention consisting of teacher feedback, praise, and picture cards was then used to support children's social interactions and play. A multiple baseline design indicated that the package was effective for increasing children's cooperative play in the exchange of activity-related comments. In addition, each playgroup continued to demonstrate these positive outcomes during a maintenance condition. (Contains 2 tables and 1 figure.)