Drawing upon their new edited volume of essays looking back on the school reforms of the Bush and Obama years, the authors explain just how few of those reforms went according to plan. Some of the unexpected outcomes were positive, they note, pointing to the improvement of school data systems and the bipartisan compromise that put an end to No Child Left Behind. Some of them were negative, such as a public backlash against achievement testing in general and the implementation of the Common Core in particular. And all of them should lead reformers to question their own certainty about how their policy ideas will play out.