When state leaders and national partners in the development of the Next Generation Science Standards met to consider implementation strategies, states and school districts wanted to know which materials were aligned to the new standards. The answer from the developers was short but not sweet: You won't find much now, and it's going to take time. As a partner in the development of the new science standards, the American Association for the Advancement of Science (AAAS) is committed to its success, but is realistic about the challenges that lie ahead. In this article, the authors, who hail from the AAAS, discuss how two major differences--three dimensional learning and performance expectations--are likely to affect the design and use of textbooks and other curriculum materials. But help is on the way. With the release of the Educators Evaluating the Quality of Instructional Products (EQuIP) rubric, science educators and curriculum developers and publishers now have a set of criteria they can use to assess materials, lessons, and units.