The committee was especially attentive to the feedback on the learning progressions. The detailed progressions were changed to grade band endpoints, with the number of details significantly reduced. Meanwhile, the introductory discussion of each core idea was expanded into a single coherent statement that reflected the idea’s overall knowledge content.

To address the concerns about grade-level appropriateness, the committee solicited additional comments from six experts in science learning in grades K-5. Based on this feedback and review of the document by committee members with expertise in elementary school science, some core ideas or component ideas were excluded at the K-2 level, with development of these ideas beginning instead in the 3-5 grade band.


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