The objective of this report is to review studies that report language and literacy outcomes associated with preschool curriculum-based interventions. Results from studies reporting on interventions targeting preschool children from low-income families were included regardless of the specific type of program. Although the majority of preschool interventions target classrooms affiliated with Head Start, studies with alternative programs were also considered. Results will help inform administrators and policy makers of the effectiveness of curriculum-based preschool interventions. (Contains 2 tables and 1 figure.)