When Susan McClarty’s district made the switch to open educational resources, the 6th and 7th grade science teacher at Centennial Middle School in Broken Arrow, Okla., initially struggled to find quality materials aligned with the Next Generation Science Standards. “We were kind of wading through water, trying to create something out of nothing,” she said. But last school year, her school participated in a field test for a new, open-source middle grades science curriculum: OpenSciEd. The units were easy to use and emphasized hands-on discovery, she said, and using them took the pressure off of teachers to shape a coherent curriculum.