According to Cable Green, Director of Open Education at Creative Commons, "Open Educational Resources are online or printed materials that are free and openly licensed. These resources may be used or repurposed as teaching, learning, and research resources by others. OER can include course content, textbooks, streamed content, assessments, and other learning materials. High-quality OER provides access to knowledge and content that may have been cost prohibitive to many previously when the material was only provided in an expensive textbook. OER promises to drive down the costs to students and improve knowledge and best practices through collaboration."