When should a student writing a research-based paper directly quote a research text instead of paraphrasing or summarizing it?

when the words quoted are specific and unique

Explanation:

Direct quotations can be used as a rhetorical tool when words used communicate an idea that is stated in a specific and unique way. This type of quotation happens when the passage explains the idea in a way so complete and sufficient that it can not be reformulated.

When it is a statement of facts.