ACT Reading: Evaluate Source Credibility and Author Bias Using Evidence

Marker 1: Use of evidence. Does the author cite studies, data, expert testimony, or peer-reviewed research? Or do they rely on anecdotes and assumptions? Example: "Research from the American Heart Association shows..." is credible; "In my opinion..." is not. Marker 2: Acknowledging opposing views. Credible authors present counterarguments and explain why their position is stronger. Biased authors ignore or mock opposition. Marker 3: Transparent author credentials. Does the author disclose their background, potential bias, or funding source? Transparency signals confidence. On ACT Reading, assess source reliability by asking: What evidence supports this claim? Do they address counterarguments? Are they transparent?

Passages often signal credibility clues in headers or author bios. "This article is from The New England Journal of Medicine" suggests peer review and expert scrutiny. "This is my personal blog" signals opinion, not research.

Red Flag 1: Emotional language without evidence. "This tragedy demands action!" is persuasive but not credible without data. Red Flag 2: Ad hominem attacks on critics. "Anyone who disagrees is foolish" avoids addressing counterarguments. Red Flag 3: Citing only sources that agree. Credible authors cite dissenting research and explain why they reject it. Red Flag 4: Extreme claims without proportional evidence. "This discovery will change everything!" demands strong support. On ACT Reading, multiple red flags suggest bias, not credibility.

Checklist: Read with skepticism. Ask after each claim: What evidence supports this? If the passage doesn't answer, be wary.

Source A: "A 2023 Harvard study of 5,000 participants found that X increases Y by 15%. These findings align with previous research (cite 3 studies). However, limitations include..." Source B: "X obviously increases Y. Everyone agrees. Don't listen to critics." Which is credible? Answer: Source A (cites study, sample size, limitations; acknowledges debate). Source B has no evidence, dismisses opposition, uses emotional language. For each source pair, identify which presents evidence and which relies on assertion.

Find a credible news article and an opinion blog on the same topic. Compare their use of evidence, acknowledgment of counterarguments, and transparency. Notice the difference in tone and rigor.

ACT Reading assesses whether you can distinguish credible arguments from persuasive manipulation. College and career success depend on your ability to evaluate sources and think critically. Expect 1-2 questions per Reading section about credibility, bias, or author reliability.

This week, evaluate two articles on a controversial topic—one from a peer-reviewed journal, one from a blog. Note the differences in evidence, tone, and bias. By test day, you'll instantly recognize credibility markers on ACT passages.