Because this article is about being a good teacher and a teacher's education favorable. A practical guide for it to be a good teacher, students and colleagues of colleagues.
Since this article is about being a good teacher and a good knowledge of the teacher. The recommended practice is also to be a good teacher-to-student and colleague of a colleague.
Because this article is about a good teacher and knowledge of a good teacher. Were introduced in practice how to be a good teacher to students and colleagues of the colleagues.