OER means "Open Educational Resource" and ZTC means "Zero Textbook Cost." These two acronyms are often confused, but do not mean the same thing. A zero textbook cost course is one that uses learning materials that cost the students zero dollars. The main method of eliminating textbook costs in courses is by adopting Open Educational Resources (OER). OER is not the only method of creating a zero textbook cost course since WHCL Library materials and some online educational materials (e.g. websites, videos, tutorials) are also free to the students. ZTC is our goal and OER is one of the methods to achieve that goal.