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Common Core ELA8th GradeReading: Informational

RI.8.8: Evaluate an Argument and Spot Irrelevant Evidence

Also written as CCSS.ELA-LITERACY.RI.8.8 · Cluster: Integration of Knowledge and Ideas.

All 41 8th Grade ELA Standards

The Official Wording

Delineate and evaluate the argument and specific claims in a text, assessing whether the reasoning is sound and the evidence is relevant and sufficient; recognize when irrelevant evidence is introduced.

Common Core State Standards, Grade 8, Reading: Informational Text · Read it at the source · Checked October 14, 2026

What RI.8.8 Means in Plain English

Eighth graders lay out an argument claim by claim, then test it: does the reasoning hold, is there enough evidence, and does every fact belong? A letter urging a town to drop gas leaf blowers might pair a solid pollution study with car sales figures that prove nothing.

Seventh grade (RI.7.8) traced and evaluated an argument’s reasoning and evidence. Eighth grade adds spotting irrelevant evidence, facts that sound impressive but prove nothing. In ninth and tenth grade (RI.9-10.8) students judge whether reasoning is valid and identify false statements and fallacies.

RI.8.8 I Can Statements

  • I can outline an argument’s main claim and supporting claims.
  • I can judge whether the evidence is relevant and sufficient.
  • I can spot evidence that sounds impressive but proves nothing.

RI.8.8 Worked Example

The letter makes three claims of very different strength and closes on a fact that supports none of them.

Read the Story
To the town council: Our town should phase out gas-powered leaf blowers and switch to electric ones within two years.First, gas blowers pollute. California’s air quality board found that running one popular commercial model for an hour releases about as much smog-forming pollution as driving a car roughly 1,100 miles.Second, the switch will not cost anyone extra. My electric blower cost less than my old gas one.Third, a ban will solve our town’s air pollution problem, because leaf blowers are the dirtiest machines most of us own.Finally, electric cars are a growing share of new car sales across the country. The future is electric, and our town should be part of it.
A short passage written for this page.
Question: Lay out the letter’s argument. Which claim holds up, which is thinly supported, where does the reasoning break, and which evidence is irrelevant?
Not Yet“The letter is convincing because it uses real facts, like the California pollution study and how electric cars are the future.”It counts facts instead of testing them. Car sales say nothing about leaf blowers, and the answer misses that one person’s purchase is thin evidence and that the third claim does not follow.
Meets the Standard“The main claim is that the town should phase out gas leaf blowers within two years. Claim 1, that gas blowers pollute, is relevant and well supported by the California study. Claim 2, that switching costs nothing extra, rests on one person’s purchase, which is not sufficient, especially for landscaping crews. Claim 3 is unsound: even if blowers are the dirtiest machines most people own, cars and furnaces still pollute, so a ban cannot solve the town’s air problem. The electric car sales are irrelevant, since buying cars says nothing about leaf blowers.”It outlines the argument first, then tests each claim on its own, separates thin evidence from a broken chain of reasoning, and names the irrelevant fact and why it does not belong.
Question Stems to Use
What is the writer’s main claim? Which claims support it?What evidence backs each claim? Is it enough?Does this reason actually lead to that conclusion?Which fact would you cut because it supports no claim?Which claim is the strongest, which is the weakest, and why?

Common Mistakes with RI.8.8

Counting facts as strength

“It has a lot of evidence, so it’s a strong argument.”

Try this: Have students match each fact to the claim it supports, and treat any fact with no match as a red flag.

Mixing up insufficient and unsound

Calling the writer’s one purchase “bad reasoning”

Try this: Teach two separate questions: “Is there enough evidence?” and “Does the reason lead to the claim?” Answer both for every claim.

Throwing out the whole argument

“The air pollution claim is exaggerated, so the letter is wrong.”

Try this: Have students judge each claim separately before giving an overall verdict, so one weak claim does not sink the strong ones.

Where RI.8.8 Fits

Comes BeforeRI.7.8Trace and evaluate an argument, judging whether the reasoning is sound and the evidence relevant and sufficient.
AlongsideSL.8.3Evaluate a speaker’s argument the same way, including spotting irrelevant evidence.W.8.1Support claims with logical reasoning and relevant evidence from credible sources.
Comes NextRI.9-10.8Judge whether an argument’s reasoning is valid and identify false statements and fallacious reasoning.

Practice RI.8.8

Quick Check

  1. What is the letter’s main claim?
  2. Why is the evidence that switching “will not cost anyone extra” not sufficient?
  3. Which evidence is irrelevant, and why?

RI.8.8: Other Names

RI.8.8CCSS.ELA-LITERACY.RI.8.8

Common Core State Standards © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved. Official wording from the Common Core State Standards PDFs at corestandards.org, last checked October 14, 2026. The explanation, I can statements, example, mistakes and practice on this page are EMStudio’s own, written beside the official wording. They are not part of the standard.