Common Core State Standards
Common Core State Standards (http://www.corestandards.org/)
Massachusetts Common Core State Standards Initiative (http://www.doe.mass.edu/candi/commoncore/)
Common Core State Standards Video Series: Mathematics (http://www.sedl.org/pubs/catalog/items/ms104.html). "The Common Core State Standards (CCSS) videos are designed to support states, schools, and teachers in the implementation of the CCSS. Each video is an audiovisual resource that focuses on one or more specific standards through examples and illustrations geared to enhancing understanding. The intent of each content-focused video is to clarify the meaning of the individual standard rather than to be a guide on how to teach each standard, although the examples can be adapted for instructional use." (SEDL, previously known as Southwest Educational Development Laboratory).