It may sound obvious, but any OER should be evaluated before use or re-use. Think about its content quality, tech currency, accuracy, audience and UDL fit. Rubrics can also help with this process. In more detail this can be outlined as:
Scope: Content is (a) peer reviewed or contains appropriate references to verifiable resources, (b) original or from a primary source (which you can locate and use instead), and (c) aligned to the course’s learning objectives.
Authority: The publisher is known and respected among professionals, the author is an expert in the field, the host site is reputable, and the content is unbiased.
Reliability: The content (a) was published recently or contemporary to the discovery of the information, (b) is highly trafficked or referenced, and (c) is located on a stable URL (e.g., on the institution’s own servers, on a library or government archive site, on the site of a repository or organization that has a long track record).
Licensing: Content is published under a flexible and easy-to-meet licensing requirement (e.g.,a Creative Commons / CC license).
Accuracy: Content is thoroughly documented, is updated frequently, and aligns with the course’s other materials and objectives.
Professionalism: Content has quality graphics, no broken links, complementary color schemes, and an uncluttered layout. Content does not require any kind of registration to access.