A Comprehensive K-3 Reading Policy establishes support and intensive reading interventions for K-3 students to ensure they read on grade level by the end of third grade. The policy also requires third grade students to demonstrate sufficient reading skills for promotion to fourth grade. For students severely below grade level and who do not qualify for a good cause exemption, retention provides struggling readers the additional time and intensive interventions they need to catch up with their peers. This toolkit presents: (1) Comprehensive K-3 reading policy fundamental principles; and (2) Detailed fundamental principles.