A Claim-Evidence-Reasoning answer helps you turn a question into a clear, supported written response. It matters because strong writing is more than giving an opinion or copying a quote. In grades 6 to 12, CER gives you a simple structure for explaining what you think, proving it with text or facts, and showing how your proof connects to your idea.
This structure works for literature, nonfiction, history, science, and test responses.
Understanding How to Build a Claim-Evidence-Reasoning Answer
Start by reading the prompt with care. Circle the action word, such as explain, compare, argue, or analyze. Then notice the limits of the task.
A prompt about one character’s decision needs a focused answer about that decision, not a summary of the whole story. Before writing, put your answer into a few plain words. This step keeps the paragraph from wandering.
A useful claim is specific enough that a reader can tell what you will prove. Broad statements such as the character is nice are hard to support. A claim about how the character helps someone despite a personal cost gives you a clearer path.
Evidence needs context. Do not drop a quotation into a paragraph and expect it to speak for itself. Introduce who is speaking, what is happening, or where the detail appears.
Choose the smallest piece of proof that does the job. A long quotation can hide the important words. After selecting a detail, look closely at its language.
A repeated word, a strong verb, a number in a chart, or a contrast between two events may matter more than the rest. In nonfiction, check whether the source is reliable and whether the data truly fits the point. One fact can be accurate but still fail to support the claim you are making.
Reasoning is where readers see your thinking. Name the connection between the detail and your idea. Explain what the evidence suggests, why that suggestion matters, and how it answers the prompt.
For example, if a character gives away food while hungry, the reasoning should not merely say that this proves kindness. It should explain that giving up something needed personally shows concern for another person over personal comfort. This distinction matters in school writing because teachers assess interpretation, not just quote collection.
In science, reasoning may use a principle to explain results. In history, it may show how an event led to a later change. The same habit helps outside class when you explain a choice using facts rather than unsupported opinions.
Watch for common weak spots during revision. Some writers make a claim, add evidence, then repeat the claim in different words. Others explain a detail that does not answer the prompt.
Read each sentence and ask whether it has a job. The claim should answer the task. The evidence should be precise.
The reasoning should make the link visible. A closing sentence can show the larger meaning of the point or lead into the next idea.
If you use more than one piece of evidence, explain each one before moving on. Strong responses feel clear because the reader never has to guess why a detail was included.
Key Facts
- CER = Claim + Evidence + Reasoning.
- Claim = your main answer to the question in one clear sentence.
- Evidence = specific proof from the text, data, or source, such as a quote, fact, example, or detail.
- Reasoning = your explanation of how the evidence proves or supports the claim.
- A strong CER paragraph often follows this order: claim, evidence, reasoning, closing sentence.
- Use sentence starters carefully, such as The text states, This shows, and This supports my claim because.
Vocabulary
- Claim
- A claim is the main answer or position you are trying to prove.
- Evidence
- Evidence is the specific proof you use to support your claim, such as a quote, fact, detail, or example.
- Reasoning
- Reasoning is the explanation that connects your evidence back to your claim.
- Citation
- A citation tells where a quote, fact, or detail came from so the reader can find it.
- Analysis
- Analysis is close explanation of what evidence means and why it matters.
Common Mistakes to Avoid
- Writing a claim that is too vague, such as The character is interesting, is weak because it does not directly answer the question or give a clear position.
- Dropping in a quote without context is confusing because the reader may not know who is speaking, what is happening, or why the quote matters.
- Repeating the evidence as reasoning is wrong because reasoning must explain the connection, not simply restate the quote or fact.
- Using evidence that does not match the claim weakens the answer because proof must directly support the point you are making.
Practice Questions
- 1 A student writes 1 claim sentence, 2 evidence sentences, and 3 reasoning sentences. How many total sentences are in the CER response, and which part takes up the most space?
- 2 You need to write a 12-sentence CER response with 1 claim sentence and 1 closing sentence. If you include 3 pieces of evidence and give each one the same number of reasoning sentences, how many reasoning sentences can follow each piece of evidence?
- 3 Read this claim: The narrator is unreliable. Explain what kind of evidence would best support this claim and why reasoning is still needed after the evidence.