ClassroomEvaluate & SampleResearchReading & Language Arts HMH Research Reading & Language Arts Core Reading & Language Arts Products Back to main Grades K–6 see the proven results Grades 6–12 read the efficacy study Grades K–12 see the efficacy studies Grades 6–12 review the research Reading Intervention Products Grades 4–12+ see the results Grades K–2 read the professional papers Grades K–2 see how iread works Grades 3–12+ see the results Grades 3–12+ read the professional papers Grades 4–8 review the research