Open educational resources produced for higher education are increasingly finding a foothold in K-12 too. A new practice by OER publisher OpenStax will help bridge the gap by aligning the contents of its textbooks with high school learning standards. The first example of the project specifically maps the content the OpenStax AP Biology textbook and the College Board's recently updated Course and Exam Description (CED) for AP Biology.
https://thejournal.com/articles/2019/11/14/openstax-k12-oer-unit-intros-crosswalk-doc-for-ap-biology-mapping.aspx
