This study examined the practice of student teaching and the effects of student teaching upon the development of three secondary Thai language student teachers from Chiangmai Teachers' College in Chiangmai, Thailand from July to September, 1992. The research questions were: What are the methods of teaching which are used during student teaching experience, and what developments or changes occur as a result of student teaching from the point of view of the student teachers? The research methodology was qualitative, utilizing the methodologies of open-ended interviewing of student teachers as the primary mode. Other sources such as observations of student teacher teaching and student teacher journals were used to add depth to the study and to triangulate the findings. Interviews were conducted in two phases. Observations were conducted as the student teachers taught five class sessions. The data were processed using the constant comparative method. A preliminary study of three secondary teachers was conducted to test the interview guides and add direction to the study. The analysis of data resulted in the generation of the following working hypotheses: 1. Formal college training plays a more influential role in student teachers' methods of teaching than the student teachers realize. 2. Student teaching experience affects student teachers' attitude toward teaching. 3. Student teaching experience has a powerful impact on the development of student teachers as teachers and as individuals. / Graduation date: 1994