NRC/NAS Framework grade levels are unduly restrictive and do not fit with present practice

The grade level distribution for teaching component ideas or concepts in the NRC/NAS Framework is as shown below, with identical grade ranges for all concepts taught in any given grade. Higher and lower level concepts never overlap in the classroom.

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The present day grade level distribution for teaching component ideas or concepts is as shown below, with highly variable grade ranges for all concepts taught in any given grade. Higher and lower level concepts frequently overlap in the classroom.

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The STEM Education Center http://www.StemEd.info