A claim evidence reasoning response answers a question, selects relevant observations, and explains why those observations support the answer. The claim is your conclusion. Evidence is the material a reader can inspect. Reasoning supplies the connection between them; repeating a number does not supply that connection.
Below are three original worked examples: a paper-bridge investigation, a short reading passage, and a school decision. Each includes the complete practice material and a finished response. The numbers and situations are invented for teaching, not reported experiments or evidence about a real school.
What belongs in claim, evidence and reasoning?
Keep the question above your organizer. Otherwise, a correct fact can become an answer to the wrong problem. “Which bridge held more washers in these trials?” asks for a comparison. “Why did one bridge hold more?” also asks for an explanation of a mechanism.
| Part | Job | Check it with this question |
|---|---|---|
| Claim | Answer the actual question with an appropriate limit | Could someone disagree with or test this answer? |
| Evidence | Select observations, measurements or textual details | Can a reader find this in the supplied material? |
| Reasoning | Explain the relevant principle or interpretive connection | Why should this evidence change the reader's judgment? |
The CER resource hosted by Yuba Water Agency separates these responsibilities in its organizer and rubric. Our practice examples below are original. In a science class, reasoning should use a relevant scientific idea. In reading, it should explain how a character's actions support an interpretation. Those are different kinds of justification.
You do not have to draft in C–E–R order. Inspect the material, compare possible claims, and then choose the answer the evidence can support. Starting with a favorite conclusion encourages cherry-picking.
Example 1: A paper-bridge investigation
Question: In these trials, which paper-bridge design supported more washers before collapsing?
Imagine testing two bridges made from equal-sized sheets of the same paper, spanning the same gap. Design A is flat. Design B is folded into an accordion. Washers are added one at a time at the center. These are fictional classroom results:
| Design | Trial 1 | Trial 2 | Trial 3 | Mean load before collapse |
|---|---|---|---|---|
| Flat paper | 4 washers | 5 washers | 3 washers | 4 washers |
| Accordion-folded paper | 12 washers | 11 washers | 13 washers | 12 washers |
Claim: The accordion-folded design supported more washers than the flat design in all three trials under these test conditions.
Evidence: The flat bridge held 3–5 washers, averaging 4. The folded bridge held 11–13, averaging 12. Even the folded design's lowest result exceeded the flat design's highest result.
Reasoning: Changing a sheet's cross-sectional shape can make it more resistant to bending under a load. The folded design had ridges rather than a single flat sheet. With paper size, span and loading position held constant in this exercise, its consistently higher supported load is consistent with that structural explanation. The results support choosing the folded design for this setup; they do not establish how every paper bridge will behave.
Notice the boundary. The response does not say “folded paper is always three times stronger.” A ratio of averages in three invented trials cannot justify a universal claim. Moisture, fold dimensions, paper type and loading position could all matter in another investigation.
For a real activity, record those conditions before testing. Keep unexpected results instead of deleting them. If the bridges use different paper thicknesses, redesign the comparison or narrow the claim; persuasive writing cannot repair an uncontrolled experiment.
Example 2: Reading a character's decision
Question: Does Mira prioritize helping her neighbor over arriving early at the exhibition?
Use this original passage as the entire source:
Mira checked the station clock. The exhibition doors would open in twenty minutes, and she had hoped to be first inside. At the footbridge, Mr. Vale's shopping bag split. Apples rolled toward the road. Mira stopped, gathered them into her scarf, and carried the bundle to his doorway. By the time she reached the gallery, a queue curved around the corner. She joined its end and unfolded the exhibition leaflet with a grin.
Claim: Mira's actions suggest that helping Mr. Vale matters more to her in this moment than being first into the exhibition.
Evidence: She stops to collect the fallen apples and carries them to his doorway despite knowing that the exhibition opens soon. After losing her early position, she joins the back of the queue smiling.
Reasoning: Mira has a clear reason to hurry, so stopping carries a cost to her own plan. She accepts that cost to complete the help rather than simply warning her neighbor and leaving. Her reaction at the gallery is also consistent with accepting the tradeoff. Together, these details support the interpretation that helping takes priority in this scene.
This claim evidence reasoning example interprets a fictional text. It does not diagnose Mira's personality or prove she is generous in every situation. A student could argue that her smile reflects excitement about the exhibition rather than satisfaction about helping. That alternative does not erase her decision to stop, but it makes the smile weaker evidence than the costly action.
When quoting, choose a short exact phrase and identify its place in the passage. When paraphrasing, preserve the meaning. Do not invent dialogue such as “Neighbors come first” to make the claim easier to defend.
Example 3: Choosing a school-club pickup location
Question: Which location should a fictional club try next week if its priority is reducing pickup queues without leaving the accessible route?
The club is comparing its current hallway table with a covered courtyard table. Both are beside the same step-free route and staffed by two volunteers during the same ten-minute pickup period. Assume the following invented observations:
| Location | Pickup periods observed | Longest observed queue | Other constraint |
|---|---|---|---|
| Hallway table | Three | 9, 8 and 10 students | Doorway must remain clear |
| Covered courtyard | Three | 4, 5 and 4 students | Weather cover must be checked |
Claim: The club should run a short, monitored trial at the covered courtyard, provided the cover and accessible route are confirmed usable that day.
Evidence: Its longest queues were 4–5 students across the three practice observations, compared with 8–10 in the hallway. The supplied scenario places both locations on the step-free route, while the hallway also has a doorway-clearance constraint.
Reasoning: The stated objective favors the location with consistently shorter observed queues when staffing and pickup duration are comparable. Maintaining route access is a condition of the decision rather than a benefit that can be traded away. A monitored courtyard trial fits both requirements while acknowledging that weather could change suitability.
The table does not provide waiting times, total attendance or weather records. Therefore, “the courtyard cuts waiting time in half” would be unsupported. Queue length is not the same measurement as waiting time. A sensible next observation would count pickups, record waiting time using the same method, and note weather and route obstructions.
Unlike the bridge example, this is a conditional recommendation. Reasoning combines the supplied evidence with a declared decision rule. Different priorities could justify another choice; the response should expose those priorities rather than conceal them.
Fixing a response that repeats its evidence
Consider this weak bridge response:
Folded bridges are better. They held twelve washers. This proves they are better because twelve is more.
Three revisions make it useful. Replace “better” with the measured outcome, add the comparison and repeat trials, and explain a relevant structural principle. The complete example above does all three.
A quick diagnostic is to cover the evidence box and read the reasoning box. If the reasoning contains nothing except the same measurements in different words, the explanatory link is missing. Conversely, if it contains only a general lesson about structures with no reference to this setup, the link is also missing.
Another common mistake is using “because” as a substitute for explanation. “The folded design held more because it held twelve” still circles back to the observation. “Its folded cross-section can resist bending differently” introduces an explanatory idea that can be examined and tested.
A reusable organizer and feedback routine
Copy this structure into a document or make three labeled areas on a blank whiteboard:
- Question and scope: What exactly am I answering, using which material?
- Claim: My answer is … under these conditions …
- Evidence: The source or measurement shows … compared with …
- Reasoning: The relevant principle or relationship is … so these observations support …
- Limit or next check: This does not establish …; I would check …
Use sentence starters as temporary scaffolding. Younger learners might begin with one clear observation and an oral explanation. More experienced writers should include conflicting evidence, uncertainty and alternative explanations when the task warrants them. There is no universal sentence count.
| Revision criterion | Ready to use | Revise when |
|---|---|---|
| Answer | Addresses the stated question | Uses an undefined word such as “better” |
| Support | Includes relevant, checkable material | Omits the comparison or invents a detail |
| Connection | Explains a relevant principle or relationship | Repeats the observation without explaining it |
| Scope | Keeps the conclusion within the material | Turns a small example into a universal claim |
For peer feedback, ask a partner to underline the answer, circle verifiable material and draw a line beneath the explanatory connection. Then ask them to name one inference the source does not justify. That final question often catches overclaiming more quickly than asking whether the paragraph sounds convincing.
A KWL chart can organize questions before an investigation, while a Frayer model can clarify an unfamiliar concept. Neither replaces the CER response. For retaining the explanation after class, use Cornell notes and recall questions.
