“In 2012, my graduate student Will Dobbie and I collected unprecedented data from nearly 50 New York City charter schools to see which practices truly boosted student learning. Class size and teacher credentials—political obsessions for decades—mattered little. What mattered most were five concrete, replicable practices: more instruction time, high expectations, frequent teacher feedback, data-driven instruction and high-dosage tutoring. Together, these five tenets explained roughly half the difference between effective and ineffective schools.” – Roland Fryer