Evaluating Evidence and Persuasive Techniques

Anatomy of an Argument and Testing Evidence Relevance

An argument consists of a central claim supported by reasons and evidence. Evidence refers to factual information, statistics, examples, or expert testimony used to validate a claim. When analyzing any persuasive text, factual claims can generally be checked against evidence, whereas opinions express personal judgments or preferences. Even so, opinions may still contain verifiable claims within them. An assertion made without supporting reasoning or evidence is considered an unsupported claim, whether it is framed as a matter of fact or a matter of opinion.

To judge whether an author's proof is sound, you must evaluate its relevance. Determining evidence relevance requires first identifying the author's precise thesis or central claim. Relevant evidence directly relates to and logically supports the specific claim being made. In contrast, information is irrelevant when it does not logically support the claim or a related point in the argument. An author may deliberately or accidentally introduce a red herring, which is irrelevant information introduced to divert attention from the central issue. Additionally, evidence drawn from a different time or place can be relevant, but its applicability to the claim's time and place must be clearly explained.

Readers must also pay close attention to the genre and source material being analyzed. Advocacy articles, for example, are written specifically to persuade an audience to support a specific policy, cause, or viewpoint. Authors of advocacy writing often emphasize evidence favoring their position while minimizing opposing points. Within such texts, writers frequently employ anecdotal evidence, which consists of individual stories or personal experiences used to illustrate an idea. While anecdotal evidence can make an argument engaging and relatable, it does not demonstrate broad or typical outcomes.