Educators often lack the proper tools and time to teach each child to read fluently, which requires distinct and interrelated word recognition and language comprehension processes. The lack of reading proficiency strongly correlates to academic struggles throughout elementary school and beyond, creating academic performance gaps between readers that grow with each successive grade. This document describes ESSA IV Evidence for Foundations A-Z's research base. The report features a literature review, a logic model, and a description of key product features.