There are two approaches to teacher development. The reflective approach to teacher development requires teachers to think about questions in teaching and allow the teachers to develop through critical thinking. On the contrary, the non-reflective approach to teacher development doesn’t require teachers to think about questions in teaching and allow the teachers to develop through non-rational thinking. The non-reflective approach to teacher development tends to be ignored or underestimated because of the rational epistemology and the consequent conceptualization of teacher professional development. The patterns of non-reflective approaches include tacit doubting, implicit learning, etc.