Visible Learning summarizes over 800 meta-analyses relating to influences on student achievement. It found that the top influences are feedback, teacher-student relationships, mastery learning, setting challenging goals, peer tutoring, and expectations. However, ability grouping and homework have smaller effects. Expert teachers are distinguished by how they challenge students, use representations, and monitor and provide feedback. Transition between teachers is a key issue if expectations and tasks are not continuous. Overall, learning depends on the teacher's response after instruction to support each student's interpretation and application.