A premise is a reason offered to support a claim. A conclusion is the claim the author wants you to accept because of those reasons. To tell premise and conclusion apart, ask one question first: “What is the author trying to prove?”
Premise vs. conclusion: the core difference
Arguments have a direction:
> Premise(s) → conclusion
Premises give support. Conclusions receive support.
Consider this argument:
> The city added protected bike lanes on three busy streets. Bicycle injuries on those streets then declined. Therefore, the city should add protected bike lanes on other high-traffic streets.
The first two statements are premises. They provide the evidence the author relies on.
The final statement is the conclusion: the city should add protected bike lanes elsewhere. It is the recommendation supported by the earlier facts.
A conclusion does not have to be the most dramatic statement. It is simply the point that the rest of the argument is trying to establish.
Find the conclusion before labeling the premises
When an argument feels dense, do not begin by underlining every fact. First identify the statement that needs support.
Ask:
- What claim does the author most want me to accept?
- Which statement is being argued for instead of merely reported?
- What statement explains why the author included the other statements?
For example:
> Because the neighborhood’s only grocery store closed, many residents now travel several miles for fresh food. The council should approve a weekly farmers’ market.
The grocery-store closure and the difficulty obtaining fresh food are premises. The council’s approval of a farmers’ market is the conclusion.
The author is not trying to prove that the store closed. That information is being used to support a policy recommendation.
Indicator words help, but they do not decide the issue
Certain words often signal a conclusion:
- therefore
- thus
- hence
- so
- consequently
- as a result
- it follows that
- clearly
- should
Other words often introduce premises:
- because
- since
- given that
- for
- after all
- due to
- as indicated by
For example:
> Since the restaurant has received repeated sanitation violations, diners should choose another location.
“Since” introduces the premise. “Diners should choose another location” is the conclusion.
But word placement can reverse the order:
> The museum should extend its evening hours because working visitors cannot attend during the day.
The conclusion comes first. The phrase after “because” supplies the premise.
Treat indicator words as signposts, not proof. “So” may signal a conclusion, but it can also describe a sequence of events: “The store was closed, so we went home.”
Use the because test
A dependable way to check an argument’s structure is to restate it like this:
> The author concludes that ___ because ___.
If the completed sentence captures the author’s reasoning, you have likely identified the conclusion and its support correctly.
Consider:
> Electric buses cost more to purchase than diesel buses, but they have lower fuel and maintenance costs. The transit agency should replace its oldest diesel buses with electric models.
A useful restatement is:
> The author concludes that the agency should replace its oldest diesel buses because electric buses have lower fuel and maintenance costs.
The lower operating costs support the recommendation. The higher purchase price is not a premise supporting that conclusion; it is a counterconsideration or concession that makes the recommendation less automatic.
This distinction matters in LSAT-style arguments. A passage can acknowledge an objection while still arguing for one main point.
Background facts, premises, and assumptions
Not every statement in an argument has the same job.
> Last year, River County opened a public health clinic. The clinic now offers evening appointments. Since many residents work standard daytime hours, the clinic should continue offering appointments after 6 p.m.
The main conclusion is that the clinic should continue offering evening appointments.
“Many residents work standard daytime hours” is a direct premise. The fact that the clinic opened last year is background: it sets the scene but does little to support the recommendation.
Also separate stated premises from assumptions.
> More employees used the stairs after signs encouraged stair use. Therefore, signs encouraging stair use improve employee fitness.
The increase in stair use is a stated premise. The argument assumes that using stairs improves fitness enough to justify its conclusion. That assumption is not a premise because the author never explicitly states it.
Knowing this difference prepares you for flaw, strengthening, weakening, and necessary-assumption questions.
Watch for intermediate conclusions
Some arguments form a chain:
> The survey drew responses only from current customers. Current customers are more likely than former customers to approve of the service. Therefore, the survey probably overstates overall satisfaction. Thus, the company should not use the survey alone to judge customer retention.
This argument has two conclusions.
- The survey probably overstates overall satisfaction is an intermediate conclusion.
- The company should not use the survey alone is the main conclusion.
The intermediate conclusion is supported by the first two claims, then becomes support for the final recommendation.
To find the main conclusion, ask which claim the entire argument ultimately serves.
A practical LSAT-style method
Use this method on short arguments.
Mark conclusion candidates
Look for recommendations, predictions, judgments, or explanations. Words such as “should,” “must,” “probably,” and “cannot be true” often appear in conclusions.
Ask why the author believes each candidate
The answer reveals the premises. If a statement explains why the candidate should be accepted, it is functioning as support.
Identify statements that push the other way
A concession may be relevant without supporting the conclusion. In the electric-bus example, the higher upfront price is a concern the author acknowledges, not a reason to replace buses.
Write one sentence about the argument
Use this template:
> Because ___, the author concludes ___.
If it feels incomplete, check for an intermediate conclusion, a missing premise, or a background detail that does not belong in the sentence.
For more work with common argument tasks, see LSAT Logical Reasoning Question Types: How to Recognize and Solve Each One.
Practice: identify the main conclusion
Read the argument:
> The university library has used the same weekend schedule for ten years. Students reported difficulty finding quiet places to study on weekends. After the library extended Saturday hours for one month, more students used its study rooms on Saturdays. Therefore, the university should keep the library open later on weekends.
Which statement is the main conclusion?
A. The library has used the same weekend schedule for ten years. B. Students reported difficulty finding quiet places to study on weekends. C. More students used library study rooms on Saturdays. D. The university should keep the library open later on weekends. E. Saturdays are the most important study day for university students.
Answer: D. It is the policy recommendation the author is trying to establish.
- A is background. It describes the previous schedule but does not directly support later weekend hours.
- B is a premise: it gives a reason the extension could help.
- C is also a premise: increased Saturday use after the extension supports keeping later hours.
- D is the conclusion.
- E is unsupported. The argument mentions Saturday use, but it never ranks Saturdays against other study days.
The because test makes the structure clear:
> The university should keep the library open later on weekends because students needed quiet weekend study space and used study rooms more after Saturday hours were extended.
For additional practice with explained arguments, use LSAT logical reasoning questions and answers with full explanations.
Common traps
Mistaking evidence for the point
A survey result or historical fact can sound important, but importance is not the same as argumentative role. Ask what the author wants that fact to prove.
Choosing a statement that is too narrow
An argument may cite Saturday study-room use but reach a broader conclusion about weekend hours. Evidence can be narrower than the policy it supports.
Treating an assumption as a stated premise
If an unstated connection is needed to make the reasoning work, call it an assumption. Do not label it a premise merely because it seems reasonable.
Assuming the conclusion must come last
Arguments can begin with their conclusion:
> Public transit should run more frequently after concerts. Large crowds currently wait for long periods outside the venue.
The first sentence is the conclusion; the second supplies support.
FAQ
What is the difference between a premise and a conclusion?
A premise is a statement used as support. A conclusion is the claim that the premises are meant to establish. Premises answer the question, “Why believe this?”
Can an argument have more than one premise?
Yes. Arguments often use several premises. They may provide separate support, work together, or form a chain leading to an intermediate conclusion.
Can an argument have more than one conclusion?
An argument can have an intermediate conclusion and a main conclusion. The main conclusion is the author’s ultimate point; the intermediate conclusion receives support and then supports the main claim.
Are indicator words enough to identify a conclusion?
No. Words such as “therefore” and “because” are useful clues, but the direction of support matters more. Confirm your answer with the because test.
Why does identifying premises and conclusions matter on the LSAT?
You cannot reliably assess an argument’s assumption, flaw, strength, or weakness until you know what the author is trying to prove and what evidence is offered for it.
Before answering an argument question, write: “Because ___, the author concludes ___.” If that sentence is accurate, you have a stable map for the rest of the problem.