The Partnership for Reading Success — Massachusetts (PRISM) I grant is a component of Literacy Launch, an initiative to promote early literacy success for ALL Massachusetts students. This competitive grant will support local education agencies (LEAs), including districts and charter schools, to implement and sustain an evidence-based, culturally and linguistically sustaining multi-tiered system of support for literacy in grades preK–3. Ultimately, a high proportion of students in PRISM districts will meet reading benchmarks, with equitable experiences and outcomes for all student groups.