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Learn to decode why an author wrote a passage and use that insight to answer ISEE questions with confidence.
Every piece of writing exists for a reason. Whether an ancient Greek philosopher crafted an argument to persuade Athenian citizens, or a modern journalist reports on climate change to inform the public, the author's purpose — the reason the author wrote the text — shapes every decision from word choice to structure. Understanding this concept is one of the most powerful tools you can bring to the ISEE Reading Comprehension section.
The study of an author's intent has deep roots. Classical rhetoric, developed by thinkers like Aristotle, recognized that speakers and writers choose their strategies based on what they want to accomplish. Over centuries, scholars refined how we analyze texts for their underlying goals. Today, identifying author's purpose is a core reading comprehension skill tested on standardized exams like the ISEE.
On the ISEE Upper Level, you will encounter six passages across a range of subjects — humanities, science, social studies, and contemporary life. Several questions per passage will ask you, directly or indirectly, to determine why the author wrote the passage or a specific section of it. Mastering this skill helps you answer not just purpose questions, but also tone, main idea, and inference questions more accurately.
At its foundation, every passage you encounter on the ISEE was written with one dominant purpose. While real-world texts can blend multiple goals, the ISEE expects you to identify the primary purpose — the single most important reason the author wrote the text. The four major purposes you will see on the ISEE are to inform, to persuade, to entertain, and to describe. Each leaves distinct fingerprints on the passage.
One crucial ISEE strategy is to determine the author's purpose during your first read-through. Before you even look at the questions, ask yourself: "Why did the author write this?" Having an answer in mind will make you faster and more accurate when you encounter purpose-related questions — and it provides a framework for answering almost every other question type as well.
The diagram below illustrates how to move from observing textual clues to identifying the author's purpose. Think of it as a decision tree: you examine evidence in the passage, match it to characteristic signals, and arrive at the correct purpose. This visual framework will help you quickly classify passages on test day.
Notice that the diagram shows sample answer phrasings at the bottom of each branch. On the ISEE, answer choices for purpose questions often use specific verbs: "to explain," "to argue," "to narrate," or "to depict." Training yourself to match the clues you find in a passage with these verbs will dramatically speed up your decision-making on test day.
An author's purpose does not just influence the overall message — it determines word choice, tone, structure, and evidence type. By understanding these four dimensions, you can reverse-engineer the purpose from the clues the author leaves behind.
An author writing to inform uses precise, neutral vocabulary — "the experiment demonstrated" rather than "the experiment proved beyond doubt." A persuasive author selects emotionally charged words — "devastating," "urgent," "undeniable" — to steer the reader's opinion. Entertaining passages often use playful, vivid, or surprising language, while descriptive passages lean heavily on sensory adjectives and figurative expressions.
Tone is the author's attitude toward the subject. Informative passages tend to have an objective or neutral tone. Persuasive passages may sound passionate, urgent, or even indignant. Entertaining passages are often humorous, suspenseful, or reflective. Descriptive passages convey a sense of wonder or appreciation. Tone is one of the fastest clues to purpose.
Informative passages often use a logical, step-by-step organization — cause and effect, chronological order, or compare and contrast. Persuasive passages typically present a claim, support it with evidence, address counterarguments, and end with a strong conclusion. Entertaining passages follow a narrative arc with rising action, climax, and resolution. Descriptive passages may be organized spatially (top to bottom, near to far) or by sense (sight, then sound, then smell).
Informative passages rely on facts, data, and expert references. Persuasive passages use a mix of facts and emotional appeals (anecdotes, hypothetical scenarios, loaded language). Entertaining passages lean on character development, plot details, and dialogue. Descriptive passages use rich imagery and figurative devices like simile, metaphor, and personification. Recognizing the type of evidence used is a reliable shortcut to identifying purpose.
The ISEE phrases purpose questions in specific, predictable ways. Learning to recognize these question stems allows you to immediately shift into purpose-detection mode. Similarly, the answer choices contain signal words that map directly to the four major purposes. The diagram below organizes common question stems and answer-choice verbs.
Let's work through a sample ISEE-style passage and question to see the purpose-detection framework in action. Read the mini-passage below and follow the step-by-step analysis.
Question: The author's primary purpose in this passage is to
The ISEE test-makers design wrong answers to be tempting. Understanding the most common traps will help you avoid them. The table below compares traps you may encounter with strategies to overcome each one.
| Common Trap | What It Looks Like | How to Avoid It |
|---|---|---|
| Too Narrow | An answer that describes a detail from one paragraph, not the whole passage's purpose. | Ask: "Does this cover the entire passage or just one part?" The primary purpose must account for the whole text. |
| Too Broad | An answer that is vaguely true but does not capture the specific focus. Example: "to discuss science." | Ask: "Is this specific enough to distinguish this passage from any other passage on the topic?" If not, it is too broad. |
| Wrong Purpose Verb | An answer that describes the topic correctly but uses the wrong verb. Example: "to describe" when the passage argues. | Focus on the verb first. Check if it matches the tone and structure clues you identified. |
| Unsupported Inference | An answer that goes beyond what the passage says, attributing a purpose the author never demonstrated. | Every correct purpose answer must be backed by evidence in the passage. If you cannot point to specific clues, reject it. |
| Confusing Topic with Purpose | An answer that states what the passage is about rather than why the author wrote it. | Remember: topic = what; purpose = why. A passage about volcanoes could inform, persuade, describe, or entertain — the topic alone does not reveal purpose. |
The ISEE Upper Level may include paired passages — two shorter texts on similar themes that you must compare. Purpose questions on paired passages require you to analyze each author's purpose independently and then synthesize how the two purposes relate. For example, one passage might inform while the other persuades, or both might argue but from opposite positions.
| Skill | Standard Passages | Paired Passages |
|---|---|---|
| Identify Purpose | Determine the single author's purpose for one passage. | Determine each author's purpose separately, then compare. |
| Detect Bias | Recognize if the author favors one side of an issue. | Compare biases across two authors — do they agree or disagree? |
| Analyze Rhetoric | Identify persuasive techniques within one passage. | Compare how two authors use different techniques to address the same topic. |
| Synthesize | Summarize how the author's purpose shapes the passage. | Explain how two different purposes create complementary or conflicting perspectives. |
Recognizing author bias is closely linked to identifying purpose. A biased author — one who clearly favors a particular position — is almost always writing to persuade. However, even informative passages can contain subtle bias in what information the author chooses to include or exclude. On the ISEE, you should note any loaded language (words with strong positive or negative connotations), one-sided evidence (only presenting support for one viewpoint), and appeals to emotion (anecdotes designed to make you feel rather than think). These are reliable indicators that the author's purpose extends beyond informing.
Apply what you have learned by working through these five ISEE-style practice problems. Each includes a short passage or scenario. Read carefully, identify the clues, and select the best answer. Remember: there is no penalty for guessing on the ISEE, so always answer every question.
Every ISEE passage is written with a primary purpose: to inform, to persuade, to entertain, or to describe. To determine the purpose, examine three dimensions of the passage: tone (the author's attitude), evidence type (facts, emotional appeals, narrative elements, or sensory details), and structure (how the passage is organized). Build a prediction before reading the answer choices, then match the verb in the answer choice (explain, argue, narrate, depict) to your prediction.
Watch out for common traps: answers that are too narrow, too broad, or that confuse topic with purpose. For paired passages, identify each author's purpose independently, note similarities and differences, and be prepared to synthesize. Remember that there is no penalty for guessing on the ISEE — use process of elimination to narrow your choices, and always select an answer. With practice, identifying the author's purpose will become second nature — and it will improve your performance on every question type.