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There is no simple formula for evaluating sources; evaluation always depends on the facts of your own rhetorical situation.
Here is a basic framework you can use to evaluate your rhetorical situation and analyze how well your sources support it:
NOTE: For many of these questions, you may need help figuring out the answers. Do you know enough about research in this discipline to answer this question? Asking professors in the field, or librarians who work with this literature, may help.
(This framework is adapted from one created by Oregon State University librarian Anne-Marie Deitering in The Academic Writer, by Lisa Ede)
This video (5:28) will help you consider three questions you should ask in of any source you find in your research.