This study investigated the effect of a small-group storybook-based intervention on kindergarten students' vocabulary and narrative development, which is important to later reading achievement. Twenty-eight kindergarten children from a high-poverty urban school, all significantly behind their peers on standardized measures of language development (semantic and syntactic) and narrative (understanding and production), were randomly assigned to the intervention or control group. The intervention students engaged in three 30-minute storybook-based lessons per week for 12 weeks, focused on vocabulary and narrative development. The intervention students made greater gains on both standardized and nonstandardized measures of vocabulary and narrative achievement than did control-group children. (Contains 2 tables and 1 figure.)