The document defines the key components of an argument: claims, reasons, and evidence. A claim is a statement that can be argued, such as "Bob should be elected class president." A reason provides logical support for the claim, like "Bob should be elected because he's a natural leader." Evidence proves that the reason validly supports the claim, for example an anecdote about Bob leading the class on a trip. Readers should evaluate claims for being arguable, reasons for being logical and fair-minded support, and evidence for being relevant and convincing proof.