Supporting Details
& Evidence
Master the skill of finding, evaluating, and connecting supporting details in passages: the foundation of every ACT Reading question.
What Are Supporting Details?
Supporting details are the specific pieces of information an author uses to develop, explain, or defend a main idea. They are the building blocks of every passage you will encounter on the ACT.
Types of Evidence in ACT Passages
Why Evidence Matters on the ACT
Roughly \(55-60\%\) of ACT Reading questions ask you to work directly with supporting details: finding them, understanding their function, or connecting them to a main idea. Mastering this skill is the single biggest score lever.
The Evidence Hierarchy
Explicit vs. Implicit Details
| Explicit Details | Implicit Details | |
|---|---|---|
| Definition | Stated directly in the text | Suggested or implied by context |
| How to find | Scan for keywords and paraphrase | Read between the lines, use clues |
| Question stems | "According to the passage..." | "It can be inferred that..." |
| Difficulty | Lower: locate and match | Higher: interpret and connect |
| Tip | Answer is a close paraphrase | Answer must still be supported by text |
Recognizing Question Stem Signals
ACT questions use predictable language. Learning to spot these signal phrases tells you exactly what kind of evidence to look for.
The FIND Method: Step by Step
Worked Example: Explicit Detail
"The gray wolf was reintroduced to Yellowstone National Park in 1995 after a \(70\)-year absence. Within a decade, the wolf population stabilized at roughly \(100\) individuals, triggering a cascade of ecological changes that scientists refer to as a trophic cascade."
Worked Example: Inference
"Maria hesitated at the doorway, her fingers tracing the chipped paint on the frame. She had not set foot in her childhood home in twelve years, not since the night she packed one suitcase and left without saying goodbye. The house smelled of cedar and something faintly burnt, and for a moment she considered turning around."
Worked Example: Function of a Detail
"Critics dismissed the early photographs of Dorothea Lange as mere journalism, lacking the compositional sophistication of fine art. Yet her 1936 image 'Migrant Mother' went on to become one of the most reproduced photographs in American history, proving that emotional truth could be as powerful as aesthetic perfection."
Paraphrase vs. Direct Quote
ACT answer choices almost never use the exact wording of the passage. Instead, the correct answer paraphrases the original text. This is a deliberate trap: students who scan for identical words often choose distractors.
Connecting Details to Purpose
Common Mistakes to Avoid
Summary: Question Types at a Glance
| Feature | Detail | Inference | Function |
|---|---|---|---|
| Asks | What does the text say? | What does the text imply? | Why is this here? |
| Signal words | "According to..." | "Suggests..." / "Inferred..." | "In order to..." |
| Answer style | Close paraphrase | Logical extension | Author's purpose |
| Strategy | Locate + match | Clues + connect | Context + reason |
| Difficulty | Low to Medium | Medium to High | Medium to High |
Question 1 of 5
"The speed of light in a vacuum is a universal constant, approximately \(299,792\) kilometers per second. Because of this incredible velocity, light from the Sun, which is nearly \(150\) million kilometers away, takes about \(8.3\) minutes to reach Earth. This time delay means we always see the Sun as it was a short time in the past."
According to the passage, the time it takes for sunlight to travel to Earth is:
Question 2 of 5
"When Thomas finally returned to the village after twenty years abroad, he found that the old bakery had been replaced by a parking garage, and the oak tree where he had carved his initials as a child had been cut down to widen the road. He sat on a bench that was not there before and watched strangers walk past without recognition."
The passage most strongly suggests that Thomas feels:
Question 3 of 5
"Many educators advocate for longer school days, arguing that more time in the classroom leads to higher achievement. Yet Finland, which consistently ranks among the top-performing nations in education, has some of the shortest school days in the developed world. Finnish students also receive more recess time and less homework than their American counterparts."
The author most likely includes the example of Finland in order to:
Question 4 of 5
A student finds an ACT answer choice that uses the exact same phrasing as a sentence in the passage but applies it to a different context. The student should:
Question 5 of 5
"Dr. Patel's research team spent three years collecting soil samples from \(47\) locations across the Midwest. Their findings showed that farms using cover crops had \(30\%\) higher organic matter content than those relying solely on synthetic fertilizers. 'The data were so consistent,' Dr. Patel noted, 'that we could predict soil health almost entirely from a farm's cropping practices.'"
Which of the following best describes the type of evidence used in this passage?