Second Language Acquisition (SLA) has not been taught to EFL teacher trainees in almost all teacher colleges in Vietnam, and thus these teacher trainees seem to lose a chance to better understand the nature of the language classroom or to improve their profession. This book, therefore, recommends a new training component with explicit and systematic instruction in classroom-based input and interaction. This component equips EFL non-native trainees with skills in making input comprehensible to learners and encouraging the learners’ participation in classroom interaction. The training also develops trainees’ ability in classroom discourse analysis for follow-up reflection and feedback. The book suggests that such a training component should be incorporated in the pre-service EFL teacher training for secondary schools. In addition, to promote the effect of this training component on the trainees’ teaching performance and reflection ability, non-native English teacher trainees need to have an average and above level of English proficiency and should be involved in as much actual teaching of complete lessons as possible.