What are RDA mediums (text-unmediated-volume) and how do I make them understandable in Researcher?

Resources Description & Access (RDA) is a newer standard in which mediums are stored in the 336, 337, and 338 fields and have three components separated by dashes, such as text-unmediated-volume (this one is equivalent to book). Since this medium format is a little harder for patrons to understand, you can add aliases (i.e. alternative names) that will show in Researcher instead. Read more in Best Practices for Mediums in Alexandria.