Personalized instruction (by a good-enough teacher) almost always beats out any kind of standard curriculum given to 20 kids at once, no matter how good that cu

Personalized instruction (by a good-enough teacher) almost always beats out any kind of standard curriculum given to 20 kids at once, no matter how good that curriculum is. Phonics may or may not be the best way to teach reading in a classroom setting to students of diverse skills, but it's a really hard problem to solve. Even agreeing on the evaluation of outcomes is difficult. (e.g: should your scoring function be about getting kids up to a minimum standard, average performance, or increase from beginning of year?)