Consider the following usability elements when you evaluate an open textbook, open course, or other open material to be used in a class.
Does the resource provide the right to:
Retain - download, duplicate, store, and/or manage the content;
Revise - modify, adjust, and/or adapt the content;
Remix - combine the original or revised content with other material to create something new;
Reuse - use the content again; and
Redistribute - share copies of the original content with your revisions or the revisions of others?
Is the content licensed under a Creative Commons License? What are the conditions of the license? Does the license allow the intended uses?