Modern high-stakes testing really kicked into gear with No Child Left Behind, and then got another huge boost with the advent of Common Core. All through that era, teachers pushed back against the fracturing of reading instruction, the idea that reading is a suite of discrete skills that can be taught independent of any particular content.
The pendulum has begun its swing back. Content knowledge is coming back into vogue, and while there are plenty of cognitive science-heavy explanations out there, the basic idea is easy to grasp. If you know a lot about dinosaurs, you have an easier time reading and comprehending a book about dinosaurs. If you are trying to sound out an unfamiliar word on the page, it's easier if you already know the word by sound. If you learn and store new information by connecting it to information you already have banked, that process is easier if you actually have plenty of information already stored away.
Classroom teachers have known this. Some have argued that the Common Core acknowledged this (but did so in the appendix, none of which is tested material). And while much of the education reform crowd joined the "skills" push (one attempted catchphrase of the new SAT created under Common Core creator David Coleman was "skilled it"), some reformers never lost faith in the work of Ed Hirsch, Jr., who has himself stayed committed to the idea through his Core Knowledge Foundation.
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