ACT Reading: Evaluate Author Credibility and Bias—Spot Weak Arguments

Question 1: Is the author an expert or authority? Example: A doctor writing about medicine is credible; a celebrity guessing about medicine is not. Question 2: Does the author cite sources and evidence? Credible authors back claims with studies, quotes, or data. Question 3: Does the author acknowledge opposing viewpoints? Credible writers address counterarguments and explain why their view is better, not dismiss critics. Question 4: Is the author emotionally neutral or pushing an agenda? Credible writers sound balanced; biased writers use loaded language ("obviously," "no rational person disagrees"). Question 5: Does the author have a financial or personal stake in the outcome? A scientist paid by a tobacco company writing about smoking safety lacks credibility. Run these five questions mentally when you encounter an author or claim on the ACT. They unlock whether the argument is strong or weak.

Example: An essay by a cardiologist with peer-reviewed research about heart disease = credible. An essay by a celebrity with anecdotes and "common sense" about heart disease = low credibility.

Red Flag 1: Extreme language or absolute claims. "Everyone knows," "nobody disagrees," "obviously" are warning signs of bias and weak logic. Credible writers use "research suggests," "many experts argue," or "evidence indicates." Red Flag 2: Ad hominem attacks (attacking the opponent instead of the argument). "My critics are uninformed" instead of "Here is why their evidence is weak" signals weak credibility. Red Flag 3: Appeal to emotion rather than logic. "Imagine the suffering..." without data or reasoning is manipulation, not credible argument. Red Flag 4: Cherry-picked evidence. Citing only the studies that support your view while ignoring contradictory research is biased. When you see these flags, lower your confidence in the author's credibility, and watch for ACT questions that ask about bias or argument strength.

Mark one red flag per practice passage and note why it weakens the author's position.

Passage 1: "As a physicist with 20 years of research in renewable energy, I have studied solar technology extensively. My peer-reviewed publications show that solar costs have dropped 70% in 10 years. While critics argue solar is unreliable, my data indicates grid storage solutions offset this concern. However, solar is not the only answer; wind and hydroelectric play roles too." Credibility assessment: HIGH. Expert credentials, evidence cited, acknowledges counterarguments, balanced tone. Passage 2: "Everyone knows vaccines are poisoning our children. The mainstream media ignores the obvious dangers. Any intelligent person can see the connection between vaccines and autism. The government wants to hide the truth." Credibility assessment: LOW. Extreme language, emotional appeals, no evidence, conspiracy framing, ad hominem. Apply this rubric to both passages and explain your rating with specific examples.

Do this exercise with two new mini-passages daily for one week. Your credibility evaluation speed will skyrocket.

Questions about author credibility, bias, and argument strength are some of the hardest on ACT Reading because they require you to read between the lines and evaluate quality, not just locate facts. Students who master credibility evaluation answer these questions confidently while others guess. One correct credibility question (worth 1 point) is the difference between a 28 and a 29 on ACT Reading.

Dedicate two study sessions to this skill. By test day, evaluating credibility becomes automatic.