Situated in the Vietnamese context, this article argues that rather than sideline knowledge of learners in favour of subject matter knowledge and pedagogical content knowledge as the basis of the knowledge base of LTE, prominence should be given to knowledge of learners if teachers' competence to teach responsively is desired.

Describes a case study and a follow-up comparative study that focused on expert foreign language teachers' professional knowledge as it was reflected in their spoken and written discourse. Both studies provide evidence indicating that professional knowledge can develop via its verbalization in reflective-narrative discourse from personal…