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LSAT principle questions ask you to move between a general rule and a specific case in one direction or the other. Recognize them from principle, proposition or policy in the stem. Solve them by reading the principle as a conditional and checking whether the case satisfies its trigger.
Recognition is the cheapest point on the section. Every principle question announces itself in the stem, and the stems recycle a small number of formulations. Learn them and you stop spending seconds deciding what you are being asked.
Stem wordingWhat it tells youWhich one of the following principles, if valid, most helps to justify the reasoning above?Case first, rule missing. You are supplying the rule.Which one of the following most closely conforms to the principle stated above?Rule first, case missing. You are supplying the application.The principle stated above, if valid, most helps to justify which one of the following judgments?Rule to case, judgment form.Which one of the following, if true, most justifies the application of the principle above?Rule and case both given; you supply the fact that satisfies the trigger.
Read the stem before the stimulus. Knowing you are hunting rule being applied changes what you notice on the first read, and reading the stimulus cold means reading it twice.
Three steps, in this order. The order is the method, because the most common way to lose this question type is to read the answer choices before you have decided what you are looking for.
StepWhat it means in practiceWork out which direction the question runsThere are only two: the stimulus gives a case and you find the rule, or the stimulus gives a rule and you find the case that fits. Getting the direction right in the first five seconds saves you from evaluating every choice twice.Write the principle as if-thenAlmost every principle is a conditional wearing formal clothes. May publish only if there is serious public risk becomes publish leads to serious public risk required. Once it is a conditional you can check the trigger mechanically.Check scope in both directionsA principle that is broader than the case still justifies it. A principle that is narrower does not reach it. And a principle whose trigger the case fails to satisfy cannot justify the case at all, however sympathetic the case may be.
The stimulus and answer choices below were written for this page. They are not taken, adapted or paraphrased from any real LSAT question, because reproducing licensed test content is not something we do. The style is the target; the content is ours.
Stimulus.
Principle: A journalist may publish information received in confidence only if withholding it would leave the public exposed to serious risk. Application: Reyes was right to publish the factory inspection reports that an employee gave her in confidence.
Question. Which one of the following, if true, most justifies the application of the principle above?
(A) The reports showed that the factory had been releasing an untreated contaminant into the town's drinking water
(B) The employee who gave Reyes the reports did not ask her to treat them as confidential
(C) Two other news organizations had already published accounts of conditions inside the factory
(D) Reyes confirmed the contents of the reports with a second independent source before publishing
(E) The factory's owners had misled safety inspectors on several previous occasions
The answer is (A).
The principle permits publication only when withholding would leave the public exposed to serious risk. To justify Reyes publishing, you need a fact establishing exactly that condition. Contaminated drinking water is serious public risk in the most direct sense available, so choice A satisfies the trigger and the application follows.
Reviewing the four wrong answers is worth more than confirming the right one. Each was engineered to catch a specific misreading, and naming that misreading is what stops it recurring.
ChoiceWhy it failsBRemoves the case from the principle's scope rather than justifying it under the principle. If the information was not received in confidence, the rule never applies and cannot justify anything.CPrior publication elsewhere does not establish public risk. It might even suggest the risk was already being addressed.DVerification is good journalism and not the principle's condition. The rule is about risk from withholding, not about accuracy.EA history of misleading inspectors reflects on the owners' character without establishing that withholding these reports would expose the public to serious risk.
Across principle questions, the wrong answers fall into recurring shapes. Once you can name the shape you can eliminate on sight instead of arguing with each choice on its merits.
TrapHow it worksThe choice that escapes the principleMakes the rule inapplicable instead of satisfying it. Very common on justify-the-application stems.The different virtueSupplies a fact that is admirable or relevant on some other standard the principle never mentions.The over-broad principleOn rule-supplying questions, a principle so sweeping it would justify cases the argument would clearly reject.The partial triggerSatisfies one condition of a two-condition principle and quietly leaves the other unmet.
One question people always ask about principle questions is how many appear per test. There is no honest answer to give. LSAC does not publish how many questions of each type appear on a given test, and no honest page can give you a percentage without inventing it.
What is published is the scored structure: the LSAT is two scored Logical Reasoning sections and one scored Reading Comprehension section, four 35-minute sections in total including one unscored variable section, with a 10-minute intermission after section two, per LSAC's own test specifications (https://www.lsac.org/lsat/register-lsat/accommodations/specifications-lsat-and-lsat-argumentative-writing). Two of the three scored sections are Logical Reasoning, so LR carries roughly two thirds of your scored questions.
That ratio is worth planning around. A per-type count is not, because nobody outside LSAC has one.
That matters practically, because study plans built on invented percentages allocate your weeks wrong. If you read that principle questions are eleven percent of the test, ask where the number came from. It came from somebody counting a handful of released tests and rounding, which is not the same thing as a published specification.
Plan on the structure instead. Two of your three scored sections are Logical Reasoning, principle questions appear in both, and no single LR type is rare enough to skip or common enough to carry your score by itself.
Drilling principle questions in a block is efficient for learning the pattern and misleading about whether you have learned it. Blocked practice lets you know the question type before you read the stimulus, which is exactly the cue the real test removes.
The size of that gap is measured. In a classroom study of 787 students across 54 classrooms, interleaved practice produced 61 percent correct against 38 percent for blocked practice at a 33-day delay, an effect of d = 0.83, per Rohrer, Dedrick and Hartwig (2019), Journal of Educational Psychology (https://gwern.net/doc/psychology/spaced-repetition/2019-rohrer.pdf). Blocked practice felt better and tested worse.
The same reversal shows up in how students judge their own learning. Kornell and Bjork (2008), Psychological Science (https://gwern.net/doc/psychology/spaced-repetition/2008-kornell.pdf) found 78 percent of students judged massed study as good as or better than spaced study while 78 percent actually performed better spaced. Your sense that a drill block is working is not evidence that it is.
So use blocks to build the recognition, then stop. Once you can name a principle question from the stem without thinking, the questions belong back in mixed sets where you have to identify the type yourself, because identifying it is half the skill.
Review is where the points are, and review is not reading the explanation for the answer you missed. The intervention research is blunt about this: across 28 studies and more than 16,000 participants, test prep as a category produced an overall effect of g = .26, and practice tests on their own produced g = .19 at p = .233, which is not statistically significant, per Hao and colleagues (2025), Review of Educational Research (https://journals.sagepub.com/doi/10.3102/00346543251360775). Taking questions is not the active ingredient.
What did work in that same Hao and colleagues analysis was structured practice on the reasoning: workbooks at g = .40 and explicitly teaching test-taking skills at g = .35. And there was no dose response at all, with neither contact hours at p = .489 nor program length in weeks at p = .314 predicting outcomes.
More hours is not the lever. Better review is.
Concretely, for every principle question you get wrong, write three lines before you look at any explanation: what you thought the rule being applied was, what it actually was, and the exact word in the stimulus that would have told you. The third line is the one that transfers.
Then leave the question alone for at least a day before you revisit it. Testing yourself beats restudying at g = 0.50 across 61 studies, the advantage rises to g = 0.69 when the delay is a day or more against g = 0.41 under a day, and feedback roughly doubles the effect at g = 0.73 with against g = 0.39 without, per Rowland (2014), Psychological Bulletin (https://pubmed.ncbi.nlm.nih.gov/25150680/).
Every LSAC figure on this page was taken from LSAC's own pages and last checked on July 26, 2026. Prices, dates and policies move without notice, so the source link sits next to each number rather than in a bibliography at the bottom.
Where LSAC has not published something, this page says so in those words rather than filling the hole with a plausible number. That is the difference between a gap and a guess, and only one of them is safe to plan around.
The words principle, proposition, policy or precept. Then check whether the stimulus holds the rule or the case, because that determines your direction of travel.
Rewrite the principle as an if-then statement, identify which side is missing, and test whether the candidate satisfies the trigger rather than merely sounding compatible with it.
LSAC does not publish counts by question type. The published structure is two scored Logical Reasoning sections and one Reading Comprehension section, per LSAC's specifications.
Yes. Justify the reasoning stems are strengthen questions where the answer happens to be a general rule, which is why the prediction habit from strengthen transfers directly.
Yes. Only if introduces a necessary condition, not a sufficient one, and misreading it is the single most expensive error on principle questions built around permissions.
Written by Ali, Georgetown Law, founder of Lovare Institut.
August 5, 2026
August 5, 2026