This active and engaging how-to session describes professional development opportunities for PreK teachers and site directors in emergent literacy and language for their 3-5 year old students. Implementation of formative assessment and differentiated instruction through lecture and discussion. Analysis of brief video clips from prek oral language, vocabulary, and early literacy prek teacher study groups that were enacted over three years in a large multi-lingual, multi-ethnic urban setting. Connecting research to practice, we will engage the audience in specific aspects of a Relationship Based Learning Approach of Professional Development via Teacher Study Groups, demonstrating (a) how activities are modeled, practiced and enacted; (b) using collaboration to solve problems that arise in the classroom; (c) how the various elements of the meetings support a deeper understanding of the content and pedagogy as well as teacher engagement in a cohesive and action-based collaboration.