We know a lot about teaching and learning, but our knowledge is scattered across three separate domains. Educational research The first knowledge domain is centered on the world of educational research that’s been advancing what we know about teaching and learning for more than a hundred years. There’s hardly an educational issue that hasn’t been studied in education or its associated subfields, like educational psychology, adult learning, and higher education. On this large empirical foundation we could rest a more evidence-based instructional practice.