Open Educational Resources (OER) are online textbooks, online courses, media, or other teaching and learning materials published under open access licenses. Many OER licenses allow users to “remix” their content to fit your course goals. Most university-level OER are peer-reviewed, and are free or mostly free.
The low cost of OER allow faculty to broaden their course materials or mix-and-match textbook sections or chapters without requiring students to purchase or rent each book.
Bureau of Labor Statistics, U.S. Department of Labor, https://www.bls.gov/opub/ted/2016/college-tuition-and-fees-increase-63-percent-since-january-2006.htm
Retain - Make, own, and control copies of the content
Reuse - Use the content in a wide range of ways
Revise - Adapt, adjust, modify, or alter the content itself
Remix - Combine the original or revised content with other material to create something new
Redistribute - Share copies of the original content, your revisions, or your remixes with others