They are the one who assess the performance and learning of students. They are responsible to guide them in order to meet their needs. They make necessary adjustments in order to meet students’ concern. In fact, the changes in curriculum are actually dependent on the result of the observation that they are doing. This is the purpose of grading system, and it’s not to put down individuals’ learning, but to gauge, if specific teaching methods are effective or not. They coordinate it as they talk and report the matter to parents of their students. Their keen supervision is understood because of their research, and study. They don’t only teach to produce good people, but they supervise and watch their students for them to become what they ought to be.