Argument Structure & Keyword Indicators
What You Need to Know
Argument structure is the map of how an LSAT stimulus is built: which statements are premises (support), which are conclusions (claims being supported), and which are background, counterpoints, concessions, or definitions.
This matters because almost every LR question rewards you for knowing what role each sentence plays. If you can quickly label:
- Main conclusion (the author’s final point)
- Premises (reasons/evidence)
- Intermediate (subsidiary) conclusions (supported by some premises and used to support the main conclusion)
- Counterpremises/objections + rebuttals
…you’ll move faster and avoid classic traps (like picking an answer that supports a premise instead of the conclusion).
Core rule (the one to live by)
A statement is a conclusion if the author is trying to get you to believe it based on other statements in the stimulus. A statement is a premise if the author offers it as a reason to believe something else.
What “keyword indicators” do (and don’t) do
Keyword indicators are signals that often tell you a statement’s role (premise vs conclusion vs contrast). They are highly useful but not infallible.
Don’t let a keyword override logic: the real test is always “What is being supported, and what is doing the supporting?”
Step-by-Step Breakdown
Use this procedure on any argument-y stimulus (especially for Main Conclusion, Method, Flaw, Strengthen/Weaken, Necessary/Sufficient Assumption, Parallel, Role, and Point at Issue).
1) Decide: argument or not?
- Look for a claim + support relationship.
- If it’s mostly facts, descriptions, or competing viewpoints without an author’s stance, it may be non-argumentative (common in inference-style stimuli too).
Quick diagnostic: If you can ask “Why?” after a claim and the stimulus answers it, you likely have an argument.
2) Find the main conclusion (MC)
- Look for conclusion indicators (table below).
- If multiple candidates, use the support test:
- The main conclusion is the claim that is supported by other statements but does not itself support a further claim (inside the author’s argument).
- Be careful with recommendations: “Therefore, we should …” is often the main conclusion.
3) Identify premises (and mark them as P)
- Look for premise indicators.
- Any statement offered as evidence (data, studies, facts, general principles) is likely a premise.
- Ask: “Is this used to support the MC (directly or indirectly)?”
4) Watch for intermediate conclusions (IC)
An intermediate conclusion is supported by premises and then used to support the MC.
How to spot ICs:
- It has a conclusion-y tone (“thus,” “so,” “hence”) and
- Something else in the stimulus is used to prove it and
- It then helps prove the MC.
5) Separate the author’s voice from other voices
Many stimuli include:
- Someone else’s claim (a critic, a study, “some people say…”) and then
- The author’s response.
Label:
- Opponent/other viewpoint
- Author’s position
- Rebuttal (author attacking the other viewpoint)
6) Flag contrast, concessions, and pivots
Words like “however,” “but,” “yet,” and “although” often mark:
- A turn from background to the author’s real point
- A concession (something granted) followed by the author’s main thrust
7) Do a 5-second structure summary
Before going to answers, summarize in one line:
- P1 + P2 → IC → MC, with any objection/rebuttal noted.
Mini worked annotation
Stimulus:
Although the city’s traffic has worsened, commute times have not increased. Therefore, the city’s new traffic-signal timing plan is effective.
Annotation:
- “Although the city’s traffic has worsened,” = concession/background
- “commute times have not increased” = premise (evidence)
- “Therefore … plan is effective” = main conclusion
Key Formulas, Rules & Facts
Core structural roles (fast definitions)
| Role | What it does | How it behaves in the argument |
|---|---|---|
| Main conclusion (MC) | Author’s ultimate claim | Supported by others; not used to support another claim in the stimulus |
| Premise (P) | Reason/evidence | Supports a conclusion (MC or IC) |
| Intermediate conclusion (IC) | A “mini-conclusion” on the way | Both supported by premises and supports the MC |
| Background | Context, setup | Usually not support; helps you understand situation |
| Counterpremise / objection | Challenges a claim | Supports a rival conclusion or attacks the author’s reasoning |
| Rebuttal | Author’s response to objection | Weakens the objection and restores support for MC |
| Concession | “Grant” a point | Often followed by pivot to MC (via “but/however”) |
| Qualification | Limits a claim | “Most,” “some,” “generally,” “unless,” etc. |
Conclusion indicator keywords (common)
| Indicator | Typical meaning | Notes |
|---|---|---|
| therefore | conclusion follows | Strong indicator |
| thus | conclusion follows | Strong indicator |
| hence | conclusion follows | Strong indicator |
| so | conclusion follows | Can be casual; ensure it’s not just sequencing (“So, yesterday…”) |
| consequently | conclusion/result | Often conclusion |
| it follows that | conclusion | Very strong |
| we can conclude that | conclusion | Very strong |
| which shows/proves/demonstrates that | conclusion drawn | Often conclusion; sometimes introduces an IC |
| this suggests/indicates that | tentative conclusion | Still a conclusion, but weaker/qualified |
| for this reason | conclusion | Often used in recommendations |
| the point is | main point coming | Watch for MC |
| clearly/obviously | emphasis | Not a true indicator by itself; still test structure |
Premise indicator keywords (common)
| Indicator | Typical meaning | Notes |
|---|---|---|
| because | reason | If “because” introduces a clause, that clause is typically premise |
| since | reason | Could mean time (“since 1999”); don’t auto-label |
| for | reason | Formal usage; not “for two hours” |
| given that | reason | Premise |
| as indicated by | evidence | Premise/evidence |
| after all | reminder support | Usually premise |
| the reason is that | premise coming | Strong indicator |
| in view of | reason | Premise |
| due to / owing to | cause/reason | Often premise |
| insofar as | reason | Usually premise |
Contrast / pivot / concession keywords
| Keyword | What it usually signals | What to do |
|---|---|---|
| but / however / yet / nevertheless / nonetheless | pivot to the author’s real point | Slow down; what follows is often MC or key premise |
| although / even though / while | concession or setup | Identify which side the author ultimately favors |
| despite / in spite of | concession | Often followed by MC-supporting claim |
| on the contrary / instead | reversal | Track which claim is being rejected |
| rather than | contrast/choice | Often part of author’s preference/conclusion |
Conditional/exception indicators that affect structure
(These matter because they often hide assumptions and define exactly what’s being claimed.)
| Keyword | Logical function | Structural impact |
|---|---|---|
| if | sufficient condition | Often introduces a premise-like trigger |
| only if | necessary condition | Common trap; flips what students expect |
| unless / except / without | introduces a necessary condition (often) | Frequently used to state requirements |
| requires / depends on / necessary | necessity | Often key premise or key conclusion |
| guarantees / ensures / sufficient | sufficiency | Often conclusion in policy arguments |
Quantifier indicators (scope matters)
| Quantifier | Strength | Typical trap |
|---|---|---|
| all / every / always / none | strongest | One counterexample destroys a universal claim |
| most | strong but not universal | Don’t treat as “all” |
| many | moderate | Doesn’t imply “most” |
| some / at least one | weak | Can be true even if rare |
| usually / generally | probabilistic | Not defeated by exceptions |
Examples & Applications
Example 1: Straightforward premise → conclusion
Stimulus:
The museum’s attendance increased after it extended weekend hours. So extending weekend hours increases attendance.
Structure:
- P: attendance increased after extending hours
- MC: extending weekend hours increases attendance
Key insight:
- “So” is a conclusion indicator, but the real issue is causation: the premise is a correlation over time, and the conclusion is a causal generalization.
Example 2: Intermediate conclusion in the middle
Stimulus:
Any medicine that causes severe dizziness is unsafe for drivers. This new medicine causes severe dizziness. Therefore, it is unsafe for drivers, and it should not be sold without a warning label.
Structure:
- P1: if severe dizziness → unsafe for drivers
- P2: new medicine causes severe dizziness
- IC: new medicine is unsafe for drivers
- MC: it should not be sold without a warning label
Key insight:
- The “Therefore” introduces an IC that then supports a policy recommendation (the MC).
Example 3: Concession + pivot (the MC is after “however”)
Stimulus:
Although local businesses will face higher costs if the bridge toll rises, the toll increase is necessary to fund repairs. Therefore, the city should raise the bridge toll.
Structure:
- Concession: businesses face higher costs
- P: toll increase necessary to fund repairs
- MC: city should raise toll
Key insight:
- “Although” flags a concession; the author still pushes a recommendation.
Example 4: Competing viewpoints + rebuttal
Stimulus:
Some critics claim that the new recycling program is ineffective because landfill use has not decreased. But landfill use can stay constant even if recycling improves, since population growth can increase total waste. So the critics’ argument is unconvincing.
Structure:
- Opponent conclusion: program ineffective
- Opponent premise: landfill use has not decreased
- Author rebuttal premise: population growth can offset reductions
- MC: critics’ argument is unconvincing (and by implication, their conclusion isn’t established)
Key insight:
- “But” often marks the author’s pivot.
- The author’s MC isn’t “recycling program is effective”; it’s narrower: the critics haven’t proven it’s ineffective.
Common Mistakes & Traps
Keyword autopilot
- What goes wrong: You see “since” or “so” and label premise/conclusion instantly.
- Why it’s wrong: These words can be time (“since 2010”) or casual transitions.
- Fix: Apply the support test: Which statements are trying to prove which?
Confusing background facts with premises
- What goes wrong: You treat scene-setting as evidence.
- Why it’s wrong: Background often doesn’t support the conclusion; it just frames the topic.
- Fix: Ask: “If I removed this sentence, would the argument lose support?” If not, it’s likely background.
Missing the pivot after a concession
- What goes wrong: You focus on the “although/despite” clause and think that’s the author’s view.
- Why it’s wrong: Concessions are often acknowledged then overridden.
- Fix: When you see although / but / however, slow down and hunt for the author’s actual takeaway.
Mistaking an intermediate conclusion for the main conclusion
- What goes wrong: You stop at the first “therefore” statement.
- Why it’s wrong: That conclusion may exist only to support a later recommendation or broader claim.
- Fix: Check whether that “conclusion” is then used as a reason for a further claim; if yes, it’s an IC.
Attributing someone else’s opinion to the author
- What goes wrong: You assume “some people argue X” means the author argues X.
- Why it’s wrong: The author may be setting up a view to criticize.
- Fix: Track viewpoint markers: critics claim, some argue, it is said, then look for the author’s pivot (“but/however”).
Overlooking a conclusion stated as a recommendation
- What goes wrong: You treat “should” sentences as just another claim.
- Why it’s wrong: Recommendations are frequently the MC, especially in policy arguments.
- Fix: If you see should/ought/must, test whether everything else is building toward that action.
Ignoring qualifiers and quantifiers
- What goes wrong: You mentally replace “some” with “most,” or “likely” with “certain.”
- Why it’s wrong: Answer choices often exploit shifts in strength.
- Fix: Match force precisely: some ≠ most, can ≠ will, often ≠ always.
Treating explanations as arguments (and vice versa)
- What goes wrong: You see “because” and assume it’s an argument.
- Why it’s wrong: Sometimes the conclusion-like statement is already accepted, and the “because” gives an explanation (why it happened), not proof (that it happened).
- Fix: Ask: is the author trying to prove the claim, or explain an accepted fact? (On the LSAT, both can appear; question stem will usually guide you.)
Memory Aids & Quick Tricks
| Trick / mnemonic | What it helps you remember | When to use it |
|---|---|---|
| “Support test”: What’s doing the proving vs what’s being proven? | Distinguish premise vs conclusion even without keywords | Always; especially when indicators are missing or ambiguous |
| “Pivot = Point” | After but/however/yet/nevertheless, the author’s main thrust often appears | Any stimulus with contrast language |
| “Therefore is not the finish line” | A “therefore” statement can be an intermediate conclusion | When there’s a later recommendation/claim that the “therefore” supports |
| “Voice markers”: some people say / critics claim / it is argued | Separate others’ views from the author’s | Debate-style stimuli; role questions |
| “Should = likely MC” | Recommendations are commonly the main conclusion | Policy/regulation arguments |
| “Because can be proof or explanation” | Prevents mislabeling explanations as arguments | Causal/phenomenon descriptions |
Quick Review Checklist
- Identify whether there is an argument (support relationship) or mostly facts/explanation.
- Find the main conclusion using the support test (not just keywords).
- Label premises and watch for intermediate conclusions.
- Treat but/however/yet as a slow down sign; the author often pivots there.
- Separate other people’s claims from the author’s claim.
- Note concessions (although/despite) and don’t confuse them with the author’s position.
- Track quantifiers/qualifiers carefully (some/most/all; can/will; likely/certain).
- Translate indicator words into structure, then summarize: P → (IC) → MC, plus any objection/rebuttal.
You’ve got this: if you can label roles quickly, the answer choices get dramatically easier to control.