What are the five steps to analyzing an argument? Identify the conclusion, list the evidence, expose the assumptions, test for flaws, and state the evidence or response that would change the result. This sequence turns a vague reaction—“that does not sound right”—into a clear, defensible analysis.
The word argument here does not mean a disagreement. It means a set of reasons offered to support a claim.
The five steps at a glance
- Find the conclusion. What does the author want you to accept, do, predict, or believe?
- Separate the evidence from the conclusion. What facts, examples, survey results, or observations are offered as support?
- Name the assumptions. What must be true for the evidence to justify the conclusion?
- Test the reasoning for a flaw. Does the argument confuse correlation with causation, rely on an unrepresentative sample, ignore an alternative explanation, or make another unsupported leap?
- Build a rebuttal or ask for decisive evidence. Explain what would weaken the argument, strengthen it, or resolve the uncertainty.
Use the steps in that order. Many people start hunting for a flaw before they know what the author is trying to prove. That usually produces scattered notes instead of analysis.
Step 1: Find the conclusion
The conclusion is the argument’s destination. It is not necessarily the final sentence.
Look for language such as:
- therefore
- so
- thus
- this shows that
- we should
- probably will
- proves that
Then rewrite the conclusion in plain language. For example:
> “Because customer complaints fell after the policy changed, the new policy improved customer service.”
The conclusion is not “complaints fell.” That is evidence. The conclusion is: the new policy caused customer service to improve.
A useful check is to ask: If I rejected one sentence, which rejection would the author most want to prevent? That sentence is usually the conclusion.
Some arguments are deductive, meaning the conclusion is intended to follow with certainty. Others are inductive, meaning the evidence is meant to make the conclusion likely. If that distinction feels slippery, review the differences between deductive and inductive reasoning before moving on.
Step 2: Separate evidence from interpretation
Once you have the conclusion, underline only the support offered for it. Evidence may include numbers, reported experiences, expert statements, comparisons, or historical events.
For each piece of evidence, ask two questions:
- What does this fact actually establish?
- What does the author say it establishes?
Those are often very different.
Suppose an argument says:
> “After Oakville replaced its streetlights with LEDs, reported nighttime crime fell by 18 percent. Therefore, the LEDs caused the decline in nighttime crime.”
The evidence establishes timing: the lights changed, then reported crime fell. It does not by itself establish causation.
Keep a strict boundary between what is observed and what is inferred. That boundary is where most argument analysis happens.
Step 3: Name the hidden assumptions
An assumption is an unstated idea that connects the evidence to the conclusion. It does not have to be absurd. It only has to be necessary enough that, if it failed, the argument would weaken.
Return to the Oakville example. For the conclusion to work, the author is assuming that no other relevant change caused the reduction in reported nighttime crime. Perhaps policing increased, crime-reporting practices changed, or the decline reflected a wider regional trend.
A reliable way to find assumptions is to complete this sentence:
> “The argument works only if _____.”
For Oakville:
> “The argument works only if the LED installation, rather than another factor, explains the drop in reported nighttime crime.”
Another method is the negation test. Negate a possible assumption and see what happens:
> “A different factor caused the decline.”
If that statement could be true, the original causal conclusion becomes much less convincing. You have found a key assumption.
Do not make assumptions too broad. “The town manager is dishonest” is possible, but it is not required by the argument. Strong analysis targets the specific missing link between the stated evidence and the stated conclusion.
Step 4: Test for the precise flaw
Now classify the unsupported leap. The label matters less than describing the reasoning accurately, but common patterns help you work faster.
Common flaws to check
- Correlation treated as causation: Two events occur together or in sequence, so one is said to cause the other.
- Unrepresentative evidence: A small or biased group is used to draw a conclusion about a larger population.
- Alternative explanations ignored: The author treats one explanation as decisive without ruling out other plausible causes.
- Comparison problem: Two groups are compared even though an important difference may explain the result.
- Scope shift: Evidence about some cases is used to conclude something about all cases, or evidence from one setting is applied too broadly.
- Missing baseline: A change is described without showing what would have happened otherwise.
In the Oakville argument, the cleanest flaw is this: it assumes that the decrease after the LED installation was caused by the LEDs, without ruling out other explanations for the decrease.
Notice what this wording does. It names the evidence, identifies the inference, and identifies what is missing. It does not merely announce “correlation is not causation.”
For more practice translating a reasoning gap into a precise critique, see How to Approach LSAT Flaw Questions. The method transfers well because both tasks reward accurate diagnosis of the gap.
Step 5: Build a rebuttal or request the missing evidence
The final step makes your analysis useful. Do not stop at “the argument is weak.” State what would test it.
For the Oakville claim, a strong response could be:
> The crime decline may have resulted from increased patrols or a broader decline affecting nearby towns. To support the causal claim, the manager would need evidence that these factors did not account for the change, such as a comparison with similar areas that did not receive LED lights.
This response does two jobs:
- It provides an alternative explanation.
- It identifies evidence that would help distinguish between explanations.
That is the core of a strong rebuttal. You are not required to prove that the conclusion is false. You are showing that the available evidence does not yet justify it.
A ready-to-use argument analysis worksheet
Use this compact template for any short argument:
| Question | Your note |
|---|---|
| What is the conclusion? | The author claims that… |
| What evidence is given? | The argument cites… |
| What must be assumed? | This works only if… |
| What is the main flaw? | The argument fails to show that… |
| What would test the claim? | We would need to know whether… |
Here is the completed version for the LED example:
- Conclusion: LED streetlights caused Oakville’s nighttime crime decline.
- Evidence: Reported nighttime crime fell 18 percent after LED lights were installed.
- Assumption: No other important factor caused the decline.
- Flaw: The argument mistakes a sequence of events for proof of causation.
- Needed evidence: Comparable crime trends, patrol levels, reporting practices, and data from similar areas without the new lights.
Write one sentence for each row before drafting a longer response. This prevents a common problem in timed work: repeating the prompt’s facts without explaining why they are insufficient.
Applying the method to historical GRE Analyze an Argument prompts
The historical GRE Analyze an Argument task is especially well suited to this five-step method because its prompts typically present a recommendation or prediction supported by limited evidence.
Do not write a response that argues for the opposite conclusion unless the prompt asks you to do that. Instead, evaluate the author’s case:
- identify the conclusion;
- explain the unsupported assumptions;
- show how those assumptions could fail;
- state the information needed to evaluate the claim.
A response becomes stronger when each paragraph addresses one distinct gap. If the argument relies on a survey, discuss sample quality. If it predicts future success from past results, ask whether the relevant conditions will remain the same. If it claims one event caused another, examine competing causes.
For annotated practice, use these GRE Analyze an Argument sample essays and flaw explanations. When you want quick timed repetitions, the GRE argument analysis quiz puts short flawed arguments in front of you with instant feedback.
FAQ
What is the first step in analyzing an argument?
Find the conclusion. Until you know what the author is trying to establish, you cannot tell whether the evidence is relevant or sufficient.
How do I tell a premise from a conclusion?
A premise is offered as support; a conclusion is the claim supported by those premises. Try placing “because” before the evidence and “therefore” before the conclusion. If the sentence reads naturally, you likely have the right structure.
Do I need to name a formal logical fallacy?
No. Clear explanation is more important than a label. “The argument assumes the survey respondents represent all voters” is stronger than simply writing “sampling flaw.”
Can the five steps help with LSAT Logical Reasoning?
Yes. The final task changes by question type, but the foundation stays the same: find the conclusion, map the support, identify the gap, and test it. For broader practice, see this guide to improving LSAT Logical Reasoning.
What makes a rebuttal strong?
A strong rebuttal addresses the actual reasoning gap. It offers a plausible alternative explanation, counterexample, or missing fact that would materially affect the conclusion.
Conclusion
The five steps to analyzing an argument are simple: find the conclusion, separate the evidence, expose assumptions, diagnose the flaw, and identify the response or evidence that would settle the issue. With repetition, this becomes less like following a checklist and more like seeing the argument’s structure at a glance. When you want to check that the habit has formed, test yourself against the argument analysis quiz.