Because OERs may vary in quality, it is important for instructors to carefully evaluate them before using them in their course.
There are various lists and rubrics for evaluating OER. Common elements of these rubrics address:
Does the OER address one or more of the class objectives?
Is the content accurate and free of major errors?
Is the layout and interface easy to navigate, and is the information clear?
Does the OER comply with current ADA accessibility standards?
Does the OER encourage active learning and class participation? If not, are you able to add that to the resource?
Is the OER licensed for open use? Can you adapt, remix, or reuse it under a Creative Commons license?