Perhaps the most common criticism of the Common Core State Standards-Mathematics (CCSS-M) for young children is that they are not “developmentally appropriate” (e.g., Meisels, 2011). Unfortunately, the phrase “developmentally appropriate” too often functions as a Rorschach test for whatever a person wants to see or argue against.
Please visit National Institute for Early Education Research (NIEER) for the complete blog post.