By reliably quantifying the nature of student engagement at the classroom level, teachers and administrators are supplied a powerfully telling barometer by which to gauge educational quality. Also left at educational leaders’ disposal are data-informed guideposts that illuminate the improvement work left to be done. As Los Angeles Schools’ John Deasy champions in the book’s foreword, when student higher-order thinking balloons and disengagement is eradicated, test score spikes are extreme and sustained, no matter the school district’s zip code. And that means the promise of the American dream is enlivened without additionally burdening deficit-riddled budgets.