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Master the persuasive techniques authors use to shape meaning, influence readers, and elevate their writing.
Long before standardized tests existed, people recognized that certain patterns of language could move audiences to action, shift opinions, and make ideas unforgettable. The formal study of these patterns—known as rhetorical devices—stretches back more than two thousand years to ancient Greece and Rome. Understanding how authors deploy these techniques is essential on the ACT Reading section, where Craft & Structure questions ask you to analyze why an author chooses specific words, phrases, and structural patterns to achieve a particular effect on the reader.
The central question this lesson addresses is straightforward but important: How do you recognize rhetorical devices in a passage, and how do you explain their effect on meaning and tone? Once you can answer that question reliably, you will find Craft & Structure questions on the ACT far more approachable.
A rhetorical device is any deliberate technique an author uses to persuade, emphasize, clarify, or create an emotional response in the reader. These devices fall into several broad categories, but on the ACT you should focus on recognizing the device and explaining what effect it has on the passage's meaning or tone. The five foundational principles below will guide your analysis.
As you can see in the diagram, the three main branches divide rhetorical devices by their primary function. Figurative language devices create imagery or make abstract ideas concrete. Sound and repetition devices add rhythm, emphasis, or memorability to prose. Persuasive appeals target the reader's logic, emotions, or trust in the author. On the ACT, most Craft & Structure questions will ask you to identify a device from one of these branches and then explain what the author achieves by using it. Keep in mind that a single sentence can employ devices from more than one branch simultaneously—for example, a writer might use a metaphor (figurative language) arranged in parallel structure (sound and repetition) to make an emotional appeal (pathos).
Understanding rhetorical devices is not just about memorizing names; it's about understanding the mechanism through which each device operates. Every device works by creating a gap between ordinary language and the language the author actually uses. That gap—the difference between what you expected and what you got—is where meaning and emotional impact live. Let's explore this mechanism through the Aristotelian framework and the specific effects each device category produces.
Aristotle argued that all persuasion rests on three pillars. Logos is an appeal to reason: the author uses evidence, facts, statistics, and logical reasoning to convince you. When a science passage on the ACT presents data and draws a conclusion, that's logos at work. Pathos is an appeal to emotion: the author uses vivid language, personal stories, or emotionally charged words to make you feel something—sympathy, outrage, hope. Ethos is an appeal to the author's credibility or moral character: references to expertise, shared values, or respected authorities build the reader's trust.
Figurative language works by asking the reader to make a mental leap. A metaphor states that one thing is another ('Time is money'), forcing you to map the qualities of the second concept onto the first. A simile does the same thing but signals the comparison with 'like' or 'as' ('Her voice was like velvet'). Personification grants human qualities to non-human things ('The wind whispered'), which makes abstract forces feel relatable. Hyperbole deliberately exaggerates ('I've told you a million times') to emphasize intensity, while understatement deliberately minimizes ('It's just a scratch' when referring to a deep wound) to create ironic contrast.
Anaphora—repeating the same word or phrase at the beginning of successive clauses—hammers a point home and builds emotional momentum. Consider King's 'I have a dream...' repeated across eight consecutive sentences; each repetition increases the power and urgency of the vision. Parallelism uses matching grammatical structures to convey equal importance ('government of the people, by the people, for the people'). Antithesis places contrasting ideas in parallel structure ('It was the best of times, it was the worst of times'), sharpening the reader's sense of opposition. Chiasmus reverses the order of elements in two parallel phrases ('Ask not what your country can do for you—ask what you can do for your country'), creating a memorable mirror effect.
Now that you understand the three major categories, let's dig into the individual devices you are most likely to encounter on the ACT. The table below provides each device's name, a clear definition, an example, and the effect it creates. Use this as a reference guide when studying.
| Device | Definition | Example | Effect on Reader |
|---|---|---|---|
| Metaphor | A direct comparison stating one thing is another | "The classroom was a zoo." | Creates vivid imagery; makes abstract ideas tangible |
| Simile | A comparison using "like" or "as" | "Her smile was like sunshine." | Clarifies unfamiliar concepts through familiar comparisons |
| Personification | Giving human qualities to non-human things | "The shadows crept across the lawn." | Makes descriptions more relatable and emotionally engaging |
| Hyperbole | Deliberate exaggeration for emphasis | "I could eat a horse." | Emphasizes intensity; can add humor or urgency |
| Understatement | Deliberately presenting something as less significant than it is | "The Pacific Ocean is a bit damp." | Creates irony; draws attention by surprising the reader |
| Anaphora | Repeating a word or phrase at the start of successive clauses | "We shall fight on the beaches, we shall fight on the landing grounds..." | Builds emotional intensity and rhythmic momentum |
| Parallelism | Using the same grammatical structure in related phrases | "To err is human; to forgive, divine." | Signals equality of ideas; creates pleasing rhythm |
| Antithesis | Juxtaposing contrasting ideas in parallel structure | "One small step for man, one giant leap for mankind." | Sharpens contrasts; highlights the significance of differences |
| Rhetorical Question | A question asked for effect, not expecting an answer | "If not now, when?" | Engages reader; implies that the answer is obvious |
| Allusion | A brief reference to a well-known person, event, or work | "He had a Midas touch with investments." | Adds layers of meaning by invoking shared cultural knowledge |
| Irony | A contrast between expectation and reality or between literal and intended meaning | A fire station burns down. | Creates surprise; provokes deeper thinking about contradictions |
Let's walk through a realistic ACT-style passage excerpt and question, applying the three-step process from our diagram: identify the device, determine the author's purpose, and explain the effect on the reader.
Question: The author's description of the house in this paragraph primarily serves to: A) provide factual information about the building's construction. B) use figurative language and parallel structure to convey the house's symbolic role in the community. C) argue that the house should be preserved as a historical landmark. D) entertain the reader with humorous exaggeration.
Not all rhetorical devices are equally effective in every situation. Understanding each device's strengths and limitations will help you evaluate why an author chose one technique over another—a skill directly tested on the ACT. The table below compares the most commonly tested devices.
| Device | Strengths | Limitations / When It Falls Flat |
|---|---|---|
| Metaphor | Creates powerful imagery; makes complex ideas accessible; can carry thematic weight across an entire passage | If the comparison is clichéd ('life is a journey'), it loses impact; extended metaphors can confuse if the comparison breaks down |
| Anaphora | Builds emotional momentum; creates rhythmic emphasis; makes key ideas memorable | Overuse becomes monotonous; works best in persuasive or narrative contexts, less effective in analytical writing |
| Rhetorical Question | Engages the reader directly; implies the answer is self-evident; effective for building an argument | If the answer isn't actually obvious, the device can seem manipulative or unclear |
| Irony | Reveals deeper truths; adds sophistication and wit; engages critical thinking | Can be misread as literal statement; requires shared understanding between author and reader |
| Allusion | Adds depth efficiently; connects the text to broader cultural knowledge; enriches meaning with minimal words | If the reader doesn't recognize the reference, the allusion fails; can seem elitist or exclusionary |
Identifying a rhetorical device is only the first level of analysis. As you become a stronger reader—and as you encounter harder ACT passages—you'll need to move beyond naming devices to analyzing how they interact with one another and how they serve the passage's larger argument, theme, or structure. This is the bridge between ACT-level analysis and the kind of close reading you'll do in college-level English courses.
| Skill Level | ACT-Level Analysis | Advanced / College-Level Analysis |
|---|---|---|
| Identification | "The author uses a metaphor comparing the economy to a machine." | "The machine metaphor reflects a mechanistic worldview that privileges efficiency over human welfare." |
| Purpose | "The metaphor helps the reader visualize how the economy functions." | "The metaphor naturalizes the idea that economic systems are predictable, obscuring the role of human choice." |
| Interaction | "The metaphor and the parallel structure both emphasize the economy's complexity." | "The extended metaphor is reinforced by parallelism that mimics the repetitive motion of gears, creating a sonic echo of the metaphor's content." |
| Evaluation | "The author's use of figurative language makes the argument more persuasive." | "The persuasiveness of the metaphor depends on the reader's willingness to accept its implicit analogy, which some economists would dispute." |
For the ACT, you need to master the first two columns: identification and purpose. However, paying attention to how devices interact (column three) will give you an edge on the hardest questions. These questions often ask about the cumulative effect of several techniques used together—for example, 'The author's use of vivid imagery and parallel sentence structure in the third paragraph primarily serves to...' If you can see how devices layer on top of each other, you'll handle these questions with confidence.
Rhetorical devices are deliberate techniques authors use to persuade, emphasize, clarify, or evoke emotion. They fall into three main categories: figurative language (metaphor, simile, personification, hyperbole, understatement, irony), which creates vivid imagery and makes abstract ideas concrete; sound and repetition (anaphora, parallelism, antithesis, chiasmus, alliteration), which builds rhythm, emphasis, and memorability; and persuasive appeals (logos for logic, pathos for emotion, ethos for credibility), which target different faculties in the reader.
On the ACT Reading test, Craft & Structure questions ask you to follow a three-step process: (1) identify the device, (2) determine the author's purpose, and (3) explain the effect on the reader. Remember that context determines effect—the same device can serve different purposes in different passages. Always ask yourself, 'What is the author trying to accomplish here?' and connect the technique to the passage's overall argument, tone, or theme. Mastering rhetorical device analysis will not only boost your ACT score but also prepare you for the close-reading skills demanded in college-level coursework.