1. The document discusses different perspectives on what makes an effective teacher, from positivist studies that try to identify measurable teacher characteristics correlated with student outcomes, to a constructivist view.
2. A constructivist perspective emphasizes that every teacher and teaching situation is unique, and that a teacher's beliefs, understanding of their work, and interactions with students shape the learning process in complex ways.
3. For teachers to be most effective, they should critically reflect on how their expressed beliefs align with their practices, to become aware of the theories that underlie their own teaching and help students develop their own understandings.