If you had to summarize your findings in one sentence, what would it be? Maybe: It is the teacher that makes the difference. What matters most is the teacher. Or something else?

It is “Know Thy Impact.” When teachers walk into a classroom (or principal into a staffroom) and ask about knowing their impact then all good things follow for the students. This begs questions about what is meant by impact, for whom and how many derive the benefits of this impact, and the magnitude or level of gain relating to this impact.