For credibility, you want to talk about the professional, publication or research based experiences of the author. If there is more than one author, you only need to discuss the background of one (usually the lead author). If you cannot find an author, talk about the credibility of the publisher/organization responsible in 1 or 2 sentences. This may include information about the author’s credentials/expertise, what the publishing organization/journal does, and how long it’s been around. As the evaluator noted, it’s important to focus on who the author is, because non-credible authors/publishers can still use credible research.
(Hint: This sentence looks something like: “This author is credible because they hold a PhD in X field and work for X University.”)
For the relevance statements, you need to explain how the source helps to prove one or more of your thesis points. Use the four you did well as a model—for those, you specifically connected the article to a thesis point, v. stating that the article supported the topic broadly.
