What a principle question is asking
A principle is a general rule that applies beyond the specific case in front of you. Principle questions test whether you can move between the general rule and the particular case without losing precision — and they run in both directions, which is the first thing to sort out.
In one direction, the stimulus gives you a principle and asks which specific situation conforms to it. In the other, the stimulus gives you a specific judgment and asks which principle would justify it. Same underlying skill, opposite reading tasks, and answers that look quite different.
Reading the stem carefully is not optional here. Misidentifying the direction is the most common way to lose a principle question you otherwise understood.
Telling the two directions apart
| Direction | Typical stem | What the answers contain |
|---|---|---|
| Principle → case (Conform / Apply) | "Which one of the following most closely conforms to the principle above?" | Specific scenarios with named people, actions, and outcomes |
| Case → principle (Justify) | "Which one of the following principles, if valid, most helps to justify the reasoning above?" | General rules, usually phrased with "whenever," "any," or "if… then" |
| Principle → principle | "The situation described most closely illustrates which principle?" | General rules, matched against a described case in the stimulus |
A fast shortcut: glance at the answer choices. If they are concrete stories, you are applying a principle to a case. If they are general rules, you are supplying a principle for a case. This takes two seconds and prevents the most costly error on this question type.
Justify questions behave like Sufficient Assumption questions
When the stem asks which principle would justify the reasoning, treat it mechanically. The correct principle, combined with the stated facts, should make the judgment follow. This is close to how a Sufficient Assumption question works, and the same approach applies.
Identify the specific judgment being made, identify the facts offered in support, and then look for the rule that licenses moving from those facts to that judgment. The gap between them is what the principle must cover.
Example. "Delacroix promised to review the manuscript by Friday but did not begin reading until Saturday. Delacroix therefore acted wrongly." The facts: a promise was made and not kept. The judgment: acting wrongly. The principle needs to connect failing to keep a promise with acting wrongly — something like "anyone who fails to do what they have promised acts wrongly."
Now watch the scope. A principle stating "anyone who breaks a promise that causes harm to another acts wrongly" does not justify this judgment, because nothing in the stimulus establishes harm. It is a plausible-sounding rule that requires a fact the argument never gave you. Principles that import unestablished conditions are the most common wrong answers on Justify questions.
Conform questions are about precise matching
When the stimulus supplies the principle and the answers supply scenarios, your job is to find the scenario the principle actually governs. The trap answers are scenarios that feel thematically similar but fail on a specific condition.
Work condition by condition. Break the principle into its components, then test each answer against every component. An answer that satisfies three of four conditions is wrong, and it will usually be the most attractive wrong answer in the set.
Example principle: "A public official should recuse herself from a decision whenever she has a financial interest in the outcome and that interest is not disclosed in advance."
Two conditions must hold: a financial interest, and non-disclosure. An answer describing an official with a financial interest who disclosed it fully does not conform — the principle does not require recusal there. An answer describing an official who failed to disclose a personal friendship does not conform either, because a friendship is not a financial interest. Both will feel relevant. Neither satisfies both conditions.
Watch the modal verb as well. A principle saying an official "should" recuse is different from one saying she "must" or "may." Answers that convert permission into obligation, or obligation into mere permission, are a standard trap.
The common mistake
The dominant error is scope drift — accepting a principle that is broader or narrower than what the case requires. Overly broad principles feel powerful and often justify the conclusion, but on Justify questions a principle that is too broad is generally still acceptable if it covers the case; the fatal version is the principle that is too narrow, requiring facts the stimulus never supplied.
On Conform questions the error runs the other way. Students select scenarios that match the principle's theme rather than its conditions. If the principle is about disclosure and the scenario is about honesty in general, the resemblance is topical, not logical.
A third error is ignoring who the principle applies to. Principles frequently specify a class of actor — employers, physicians, elected officials, parents. A scenario involving someone outside that class does not conform, however similar the situation feels.
Finally, students often skip the stem, assume a direction, and read the answers with the wrong expectation. Two seconds spent identifying the direction prevents this entirely.
A method that works for both directions
Read the stem and name the direction. Are you given a rule and asked for a case, or given a case and asked for a rule?
Break the general statement — whichever side it appears on — into explicit conditions. Write them down if the principle is dense. Most principles have two or three components, and the question usually turns on one of them.
Identify the actor class, the triggering condition, and the required or permitted action. These three elements cover most principle statements.
Test each answer against every component rather than against your overall impression. Eliminate on a specific failed condition, and be able to name which one failed. If your reason for eliminating is "it doesn't feel right," you have not finished evaluating it.
Practice principle questions on Verbloom
Verbloom's Logical Reasoning practice includes principle questions in both directions, with explanations that identify which specific condition each wrong answer violates.
That condition-level feedback is the useful part here, since principle questions are lost on single components rather than on general misunderstanding.
Frequently asked questions
What is the difference between a principle question and an assumption question?
A Justify-the-principle question is close to a Sufficient Assumption question — the correct answer, combined with the stated facts, should make the conclusion follow. The difference is that principle answers are phrased as general rules applying beyond the case, while assumption answers are often specific to the argument at hand.
How do I know whether the answers will be scenarios or rules?
Read the stem, then glance at the choices. If the stimulus gives you a principle and asks what conforms to it, the answers are specific scenarios. If the stimulus gives you a judgment and asks what justifies it, the answers are general rules. Identifying this first prevents the most common error on this type.
Can a principle be too broad to be correct?
On Justify questions, a broad principle that clearly covers the case is usually acceptable, since the task is to license the conclusion. The more common fatal flaw is a principle that is too narrow — one requiring a condition the stimulus never established, such as harm, intent, or prior warning.
Do principle questions appear often on the LSAT?
They appear regularly in Logical Reasoning, though the exact count varies by test. They are worth studying as a distinct type because the two directions require different reading approaches, and students who treat them as generic strengthen questions tend to miss the scope conditions that decide them.
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