In the exemplary class suggested in this thesis, the TA needs to provide total four times of revision and four times of student interview. Both of the procedures are for the TA to give individual feedback to the students based on the analysis and reviews of the students` writings. The TA takes a role to provide a lesson as well as to assist the professor or lecturer in the class. He or she takes charge of two lessons during which comments are given to all the students on general tendency or problems in their writings. The TA also needs to evaluate each piece of homework and report to the professor in charge. The area a TA is in charge in a class is limited to ``reading homework``, but within this area the TA is the principal agent to evaluate and give feedback for each student`s homework as well as to provide a lecture. The principles of TA training can be summarized into four items: First, the professors and lecturers need to share the objectives of the study with the TA`s for an efficient education. Second, the TA`s should understand the general concept of teaching methodology to achieve the objectives. Third, the TA`s should be able to set the evaluation standards clearly about the writings of students. Fourth, TA training process needs to be consistently realized as the lessons progress. Lastly, TA`s status should be maintained as the principal agent of feedback as well as a lecturer.