This non-ideological, side-by-side comparison of the Common Core State Standards and Massachusetts then under development K-12 English and math standards found that Common Core not only draws heavily from Massachusetts standards, but improves upon them by incorporating some of the best international standards. The researchers found there is substantial alignment between the two sets of standards in terms of rigor and whether they are clear and measurable. One key improvement the report identified is a stronger emphasis on strategic thinking and less on recall in the Common Core standards, and the introduction of these skills in earlier grades.
Full Report here
Executive Summary here
Press Release here
English Language Arts Appendix here
Mathematics Appendix here