Conclusion, Premise, and Background
Key Takeaways
- The conclusion is the claim the author is trying to establish, not necessarily the final sentence.
- Premises are offered as support; background, examples, and concessions may be relevant without doing the main support work.
- Intermediate conclusions are supported by earlier statements and then used as support for a broader conclusion.
- Role, main conclusion, method, flaw, strengthen, weaken, and assumption questions all become easier once the sentence jobs are labeled.
Why Sentence Function Comes First
LSAC describes Logical Reasoning as a test of ordinary-language arguments, not a test of law trivia or formal vocabulary. That is why the first foundation is not a list of flaw names. It is the ability to tell what each sentence is doing.
A short LR stimulus can contain evidence, context, a concession, an opponent's view, an example, an intermediate step, and a final recommendation in five or six lines. If those jobs blur together, answer choices become much more attractive than they should be.
The conclusion is the claim the author is trying to establish. The premise is a statement offered as support. Background gives setting or context, but it is not the main reason the conclusion follows.
Function Markers To Watch
| Signal | Usual function | Caution |
|---|---|---|
| therefore, thus, so | conclusion | May introduce an intermediate conclusion |
| because, since, for | premise | Can appear inside a conclusion sentence |
| however, but, although | contrast or concession | The author's view often comes after the turn |
| for example | illustration | Usually supports a broader claim indirectly |
| critics claim, some argue | opposing position | Do not treat it as the author's conclusion |
Indicator words are helpful, but the LSAT does not reward word-matching alone. Test the relationship. If one claim is true because another claim is true, the supported claim is the conclusion and the supporting claim is the premise.
The Because-Therefore Test
A practical test is to place two claims into a because-therefore frame. If claim X fits after therefore and claim Y fits after because, X is probably supported by Y. If the order sounds backward, revise the map.
Suppose a stimulus says a clinic should extend evening hours because missed appointments are highest among patients who work daytime shifts. The appointment statistic is the premise. The extended-hours recommendation is the conclusion.
Now add a middle sentence: patients with daytime jobs have trouble attending appointments during normal hours. That middle sentence is supported by the missed-appointment statistic and supports the recommendation. It is an intermediate conclusion.
Intermediate conclusions are common traps. They sound argumentative, so they attract main-conclusion answers. Ask whether the statement is the argument's destination or a bridge to something larger.
Background Is Not Dead Weight
Background can still matter. It may define the setting, introduce a policy, explain why the issue is being discussed, or identify a comparison group. The mistake is treating background as proof when the author did not use it that way.
Consider a stimulus that begins with a city council debating whether to replace older buses. That fact frames the dispute. If the author then says maintenance costs have doubled and therefore the fleet should be replaced, the maintenance fact is the evidence.
Concessions require extra care. A concession admits something that seems to favor the other side, then the author argues anyway. In a sentence beginning although the new buses are expensive, the cost point may be conceded background, not the author's support.
A Fast Annotation System
Use short labels in practice:
- C = main conclusion
- P = premise
- IC = intermediate conclusion
- BG = background
- CON = concession
- OP = opposing view
- EX = example
Do not over-annotate on test day. The goal is a mental map, not a decorated passage. A clean map might read: BG about proposal, P about costs, IC about budget strain, C reject proposal.
How This Pays Off By Question Type
Main conclusion questions ask directly for the final claim. Role questions ask how a named statement functions inside the argument. Method questions ask what the argument does as a whole. Flaw questions ask why the support does not justify the conclusion.
Strengthen and weaken questions also depend on function labels. A choice that attacks background may leave the argument untouched. A choice that attacks a premise may be too direct or outside the intended task, while a choice that attacks the premise-to-conclusion link may be exactly right.
Assumption questions are especially dependent on the map. If you misidentify the conclusion, you will look for a missing link to the wrong claim. The correct assumption usually lives between the author's evidence and the conclusion actually being defended.
Exam-Speed Function Checks
Use these questions before answer choices:
- What claim is the author trying to get me to accept?
- Which statements are given as reasons for that claim?
- Is any claim both supported and supporting something else?
- Is any statement merely setting, concession, example, or opposing view?
- Does the stem ask me to identify, describe, help, attack, infer, or explain?
Those questions keep you from treating a stimulus as one flat paragraph. LR rewards hierarchical reading. The exact topic may be transit, medicine, archaeology, advertising, or campus policy, but the recurring task is the same.
A Common Trap In Dense Arguments
A stimulus may report several facts before the author appears. Do not let the first concrete fact become the conclusion by default. Ask who is making the claim and whether later language turns that fact into support, contrast, or a rejected view.
When the passage includes a recommendation, identify whether the author endorses it or merely describes another person's proposal. LR often tests that distinction through role and main-conclusion stems.
The safest rule is this: do not evaluate persuasiveness until you know sentence function. A weak premise, a true background fact, and a final conclusion play different roles. Correct answers respect those roles.
Historian: The town's original market hall was built with imported brick, a material rarely used locally at the time. Since shipping records show that a wealthy merchant paid for a large brick delivery that same month, the merchant probably financed the hall's construction. What role is played by the statement about the market hall being built with imported brick?