At the End of the Day Once the Students Have

At the end of the day once the students have been dismissed, Mr. Dolton writes in a spiral bound notebook labeled "My Practice" while referring to both his lesson plans and course standards. As he writes, Mr. Dolton comments upon the effectiveness of the days' lessons and how he might have strengthened their content or presentation. He logs behaviors and skills deficits that he feels should be addressed either with the whole class or individual students. He allows himself to share his frustrations and areas he wishes to research further. Which characteristic of effective teaching is Mr. Dolton demonstrating with these behaviors?

A) Advocating for diverse learners
B) Promoting collaboration
C) Pre-planning instructional units
D) Reflecting upon past instructional units