These learning materials can be freely shared and usually allow for the ability to adapt them to meet student needs. Your students don’t buy the textbook because it is too expensive. The textbook has the same errors as the last edition. The bookstore is still waiting for the textbook to come in. Many instructors have faced one or more of these problems — but they don’t have to. By using an open educational resource (OER) such as an open textbook, instructors can dramatically reduce costs for students, and easily fix any errors, and students always have access.