Action research for this project was selected to meet a need for more effective vocabulary instruction in the researcher's classroom and teaching site. Current literature supports the need for more effective vocabulary instruction in early childhood. The intervention used the Expanding Expression Tool (EET) as an instructional strategy to support expressive language development in the researcher's preschool classroom. Eighteen students in a four-year-old classroom participated in an intervention using explicit instruction during large group, small group, and sharing (show and tell). Standardized and researcher created measures were used to determine significance of the outcomes. Findings showed an increase in expressive language with the descriptive units taught with the EET having the most significant growth. Results of the study will impact future instruction in the researcher's classroom as well as four-year-old classrooms at the researcher's teaching site.