Teacher reflection has been at the core of teacher development efforts for almost 100 years, yet inconsistency in the literature results from a lack of clarity on how reflection is conceptualized--from its purpose to processes, and how they relate to refining teacher practice. This article draws from research in cognitive science to explain how engaging in an ongoing reflection approach, focused on observations of real classrooms, can help teachers refine their responses to classroom situations over time. The authors also provide examples of this reflective approach from an online course for early childhood teachers focused on improving teacher--child interactions in the classroom.