The completion of this research was made possible by the contributions,
encouragement and support from many individuals. I would like to thank my
wonderful major advisor, Prof. Vantipa Roadrangka who provided constant support,
and many opportunities throughout my graduate work. . . .
I would like to give my special thanks to the teachers who participated in this
study. Their willingness to share their classrooms and their rich teaching experiences
made this study possible. . . .
Last but not least, I would like to dedicate this work to my family for their
generous and undying support at all levels. Without their belief in my ability, the
work on this dissertation project would never have happened