Question: is this a 2) strong advice, 1) weak advice 0) no advice?

Thus, as policymakers place more emphasis on the effectiveness of individual teachers and the longterm benefits of effective teaching (Chetty et al., 2012; Konstantopoulos & Chung, 2011), it is clear that what teachers do in the classroom, their use of evidence-based instruction, their ability to differentiate this instruction, and the training and professional development they receive all make a difference in student learning and, hence, in teachers’ value-added scores. 
user
This is no advice
assistant