Reading intervention programs target specific reading skills and strategies like phonemic awareness, phonics, fluency, comprehension, and vocabulary. Interventions are structured in three tiers - tier 1 enhances core instruction for all students, tier 2 prevents or remediates skills for some students below grade level, and tier 3 intensively remediates significantly below grade level students. Effective interventions use differentiated small group instruction, guided reading, and skills-focused lessons to systematically practice skills. Interventions should be balanced, assessment-based, and support both struggling and non-struggling students. Teachers screen students, provide small group and differentiated instruction, continually assess students, and implement instruction based on assessments.