The idea of crosscutting concepts is not new or unique to A Framework for K-12 Science Education (NRC 2011) or the Next Generation Science Standards (NGSS Lead States 2013); "common themes," "unifying concepts," and "crosscutting ideas" have been presented before in previous science-education reform movements such as the National Science Education Standards, NSTA's Science Anchors Project, and Science for All Americans. Unfortunately, these ideas were neither embraced by most teachers nor widely used in state or local curricula or assessments. This time, with the NGSS, the inclusion of crosscutting concepts in all K-12 performance expectations ensures that such unifying themes or ideas will be integrated with the other two dimensions (science and engineering practices and disciplinary core ideas) to become a necessary part of science curriculum, instruction, and assessment at all grade levels.
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机译：跨领域概念并不是K-12科学教育框架（NRC 2011）或下一代科学标准（NGSS Lead States 2013）的新概念，也不是新概念。在先前的科学教育改革运动中，例如“国家科学教育标准”，NSTA的“科学锚定计划”和“全美科学”，都曾提出过“共同主题”，“统一概念”和“贯穿各领域的想法”。不幸的是，大多数教师既没有接受这些想法，也没有在州或地方的课程或评估中广泛使用这些想法。这次，通过NGSS，在所有K-12绩效期望中都包含了横切概念，从而确保将这些统一的主题或思想与其他两个维度（科学与工程实践和学科核心思想）整合在一起，成为其必要的一部分各个年级的科学课程，教学和评估。
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