This document discusses the roles of teachers and different approaches to teaching. It describes teachers as conductors, actors, gardeners, and discusses teacher-centered vs learner-centered approaches. The roles of teachers are outlined as controller, organizer, assessor, prompter, participant, resource, tutor, and observer. For each role, the document explains how the teacher enacts that role and potential advantages and disadvantages. It emphasizes the importance of teachers being able to switch between roles and tailor their performance based on the learning objective.