The Next Generation Science Standards (NGSS) advocate an integrated model of science instruction for middle schools in which the science disciplines are connected rather than separate. This model, used by other countries that are consistently successful in science, has several key benefits, including enhanced student learning and better…

Educators and policymakers have debated in recent years how best to improve academic performance in the middle grades. In the absence of outcomes-based research about what works, school districts have reshuffled grade configurations, bolstered their focus on "academic rigor," and worked to ensure that students are engaged in school as…