The greatest benefit of teacher preparation programs is field-related training where pre-service teachers contextualize the learned knowledge and theories with tasks and students during training. This preliminary study is based on the collaboration between a teacher training program and an elementary school to investigate the effect that exposure to various sources of teacher efficacy has on pre-service teachers in Taiwan. The results of this study show some influences of classroom experience and group discussions on the teaching efficacy of this group of pre-service teachers. Pre-service teachers demonstrated a higher level of "PTE" after the classroom experience and group discussions. (Contains 1 table.)