How do you state the central idea of an informational text as a full sentence, and how do you tell it apart from a supporting detail or a single fact?
Analyzing central ideas in informational texts on the Ohio English II test: stating the controlling idea of an article or essay as a full sentence, distinguishing the central idea from supporting details and from the topic, tracing how the central idea is developed across paragraphs, and writing an objective summary that captures it.
How to analyze central ideas on the Ohio English II test: stating the controlling idea of an informational text as a full sentence, telling it apart from a detail or the topic, tracing how it is developed, and writing an objective summary. The central idea is the nonfiction cousin of theme.
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What this skill is asking
The central idea of an informational text is the controlling point the whole piece is built to make, and stating it precisely is a core task on Ohio's State Test for English Language Arts II. It is the nonfiction cousin of theme: where a story develops an idea about life, an article or essay develops a controlling point about its topic. Ohio's Learning Standards put this under Key Ideas and Details in the Reading: Informational Text strand, and the items ask you to state the central idea as a full sentence, to tell it apart from supporting details and from the topic, and to write an objective summary that captures it. This page covers how to find the central idea, how to distinguish it from the many true-but-partial details around it, and how to summarize a text without adding opinion.
Central idea versus topic versus detail
The reliable test is the same one used for theme in analyzing theme in literary texts: if your answer is one or two words, it is a topic; if it is a single fact, it is a detail; the central idea is the full sentence that all the details serve. When a multiple-choice item offers four true statements, the central idea is the one the others support, not the most specific or the most striking.
Tracing how the central idea develops
Because each paragraph contributes to the central idea, this skill connects to text structure and organization: how a text is organized is how its central idea is built. And when the text is an argument, its central idea is its main claim, which leads into analyzing argument and claims.
Writing an objective summary
Try this
Q1. What is the difference between a central idea and a supporting detail? [Recall]
- Cue. The central idea is the controlling point the whole text develops, stated as a full sentence; a supporting detail is a fact or example that backs it but is not the main point.
Q2. An article describes three problems with a city's bus system, then proposes a funding plan to fix them. State its central idea. [Short explanation]
- Cue. The city's bus system has serious problems that a specific funding plan could solve. The three problems and the plan are supporting points; the controlling idea is that the problems justify the proposed funding.
Exam-style practice questions
Practice questions written in the style of ODEW exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Ohio English II EOC (style)1 marksAn article explains how city parks lower temperatures, clean the air, and improve residents' mental health, then argues cities should fund more of them. Which best states the central idea? (1) Parks have trees. (2) City parks bring measurable benefits that justify greater public investment. (3) One park in the article is large. (4) Mental health matters.Show worked answer →
Answer: (2). The central idea is the controlling point the whole text develops, stated as a full sentence. The article's benefits and its call for funding all support the idea that parks' measurable benefits justify investment, so (2) is the central idea.
Why not the others: (1) and (3) are single details; (4) is a true but partial point that the article uses, not the controlling idea. Only (2) captures what the whole text is built to say.
Ohio English II EOC (style)1 marksWhich sentence would best begin an objective summary of an informational passage?Show worked answer →
An objective summary states the central idea and the main supporting points in your own words, without opinion or added information. The best opening sentence names the topic and the controlling idea (for example, "The article argues that city parks deliver benefits worth greater public funding") rather than a vivid detail or your reaction to it.
The traps are summaries that copy a striking line, add the reader's opinion ("I think parks are great"), or list details with no central idea. Objective means no judgement; summary means the main idea first.
Related dot points
- Analyzing argument and claims in informational texts on the Ohio English II test: identifying the central claim, the reasons that support it, and the evidence behind the reasons, distinguishing a claim from a fact and from an opinion, recognizing a counterclaim, and evaluating whether the reasoning is valid and the evidence relevant and sufficient.
How to analyze argument on the Ohio English II test: identifying the central claim, reasons, and evidence, telling a claim apart from a fact, recognizing a counterclaim, and judging whether reasoning is valid and evidence is relevant and sufficient. The test rewards evaluating reasoning, not just summarizing it.
- Analyzing author's purpose and rhetoric in informational texts on the Ohio English II test: determining the author's purpose and point of view, distinguishing purpose (to inform, persuade, or explain) from topic, and analyzing rhetorical choices such as word choice, tone, and the appeals to logic, emotion, and credibility (logos, pathos, ethos) and their effect.
How to analyze author's purpose and rhetoric on the Ohio English II test: determining purpose and point of view, telling purpose apart from topic, and analyzing word choice, tone, and the appeals to logic, emotion, and credibility. The test rewards explaining how a rhetorical choice advances the purpose.
- Analyzing text structure and organization in informational texts on the Ohio English II test: recognizing common structures (cause and effect, compare and contrast, problem and solution, chronological or sequential, claim and support) and explaining how an author's structural choice, including the order of paragraphs and the placement of a key idea, advances the central idea or argument.
How to analyze text structure on the Ohio English II test: recognizing cause and effect, compare and contrast, problem and solution, chronological, and claim and support structures, and explaining how the organization helps the text make its point. The test rewards effect, not just naming the structure.
- Making inferences and citing text evidence on the Ohio English II test: drawing a logical inference from what a text states and implies, distinguishing an inference from a guess and from a restatement, citing the strongest evidence that supports an analysis, and handling evidence-based two-part items where Part A is the inference and Part B is the supporting line.
How to make inferences and cite evidence on the Ohio English II test: drawing a logical inference, telling it apart from a guess or a restatement, and citing the strongest supporting line. The evidence-based two-part items make this the most tested habit on the whole test.
- Analyzing theme and central idea in literary texts: stating a theme as a complete sentence about life or human nature rather than a topic word, distinguishing theme from subject and from moral, and tracing how a writer develops a theme through plot, character, and detail across an unseen Ohio English II literary passage.
How to analyze theme on an Ohio English II literary passage: stating theme as a full sentence about life rather than a one-word topic, telling theme apart from subject and moral, and tracing how plot, character, and detail develop it. Theme appears in multiple-choice, multi-select, and evidence-based two-part items.
Sources & how we know this
- ELA II course resources — ODEW (2025)
- Ohio's Learning Standards for English Language Arts — ODEW (2025)