Principle.
Two question types inside one label.
When Principle acts like Strengthen and when it acts like Sufficient Assumption. The four sub-patterns. Why most students only prepare for one.
Also known as: Supporting principle.
Principle questions split into two distinct tasks. The first task (principle-supports-argument) asks for the general rule that justifies a specific argument, similar to Strengthen. The second task (case-matches-principle) applies a stated principle to a new case, similar to Sufficient Assumption. Misidentifying the subtype is the primary source of errors. Read the stem carefully to distinguish which task is required before evaluating any answer choice.
The pattern
A Principle question either asks you to identify a principle that supports a given argument, or to apply a stated principle to a new case. These are two distinct tasks. Principle-supports-argument (find the principle) acts like a Strengthen question: you look for the general rule that makes the argument's conclusion more defensible. Case-matches-principle (apply the principle) acts like a Sufficient Assumption question: you find the case that falls under a stated general rule.
The stem usually reads as one of these:
- Which one of the following principles, if valid, most helps to justify the reasoning above?
- The reasoning above most closely conforms to which one of the following principles?
- Which one of the following is an example of the principle stated above?
- Which one of the following judgments conforms most closely to the principle stated above?
Sub-patterns
You are given a specific argument and asked to find a general principle that supports or justifies it. This acts like Strengthen. The principle makes the argument's reasoning more defensible. The right answer is abstract and general.
You are given a general principle and asked which specific case falls under it. This acts like Sufficient Assumption. You test each choice against the principle's conditions to see which satisfies them.
You are given an argument and asked which principle shows what is wrong with it. This acts like Flaw. The principle names the error; the argument commits the error.
You are given a judgment (a conclusion) and asked which principle justifies reaching it from a stated situation. The right answer is the general rule that connects the situation to the judgment.
Three trap patterns.
The first slip
The primary miss on Principle is misidentifying the subtype. Students who see "principle" in the stem default to a single approach, usually the Strengthen approach. When the question is actually case-matches-principle, the Strengthen approach selects a principle that supports the general claim rather than one the specific case falls under. The two subtypes require different solution methods.
The compounding slip
Even within the correct subtype, the top distractor on principle-supports-argument is a principle that is true but too broad or too narrow. Students accept a principle that covers the case without checking whether it is tightly calibrated to the argument. Over-broad principles are distractor traps on every hard Principle question.
Why it sticks
On Principle, the subtype determines the method. Read the stem carefully. "Which principle justifies this specific argument" is not the same task as "which case falls under this principle."
One Principle question. Pick before you scroll.
Pick your answer before scrolling. Commit to a choice, optionally record your confidence, then reveal the explanation.
Maya decided to refund a customer who returned a book after the official 30-day return window had closed. The book was a gift from a family member, the customer had received a duplicate copy, and returning it did not cost Pinaka Books any out-of-pocket expense. Sam, at the register, watches Maya wave the policy.
Which one of the following principles, if valid, most helps to justify Maya's decision?
Pick one of the five choices on the left. The explanation reveals after you commit.
The fix
- 01
Identify the subtype before reading choices.
Read the stem. Does it ask you to find a principle (principle-supports-argument) or to apply one (case-matches-principle)? Write the subtype on scratch paper. The solution method follows from the subtype. Applying the wrong method to a Principle question wastes 90 seconds.
- 02
Drill both subtypes with equal reps.
A common prep imbalance: drilling principle-supports-argument far more than case-matches-principle. The LSAT uses both. Take 15 questions of each type in separate sessions. Accuracy on both is required to plateau-bust.
- 03
Check for coverage and tightness.
For principle-supports-argument: the right principle must cover the specific facts in the argument and be tight enough that it does not justify far more than the argument needs. Over-broad principles that say "always" or "never" usually overshoot.
The drill set adapts to your weakness.
Every Principle question in Pinaka is tagged by subtype: principle-supports-argument, case-matches-principle, principle-identifies-flaw, or principle-justifies-judgment. After your first mock, your skill map shows accuracy at the subtype level. Drills sort by your weakest subtype, not by Principle in aggregate.
The five-section explanation on every Principle item names the subtype first and applies the correct solution method for that subtype. The subtype-first habit prevents the most common Principle miss before the first choice is read.
This is sample data. Your numbers arrive after one full mock. The chart shows your accuracy on each of the 21 LSAT subskills, with an evidence count on each. The lowest peak is where Pinaka starts your drilling.
Skills closely related to this one.
See how this skill fits in the full LSAT skill taxonomy.
Principle questions, answered.
Is there a way to tell Principle subtypes apart quickly from the stem?
Yes. "Which principle helps justify the reasoning above" is principle-supports-argument. "Which of the following is an example of the principle stated above" or "which judgment conforms to the following principle" is case-matches-principle. "Which principle, if valid, shows what is wrong with the argument" is principle-identifies-flaw. The stem wording is reliable.
How is Principle-supports-argument different from Strengthen?
Strengthen asks for any fact that makes the conclusion more likely. Principle-supports-argument asks specifically for a general rule that justifies the argument's reasoning. Principle answers are abstract and normative ("if X, then one should Y"). Strengthen answers are specific facts. The abstraction level is the tell.
How is Case-matches-principle different from Sufficient Assumption?
SA asks for a premise that, if added, makes the conclusion follow. Case-matches-principle gives you the principle already and asks which specific case satisfies its conditions. SA is about closing a gap. Case-matches-principle is about matching conditions. The direction of the task is reversed.
Recap
Principle. splits into two tasks. Identifying which one applies is the first step on every Principle question.
Principle-supports-argument. asks for the general rule that justifies a specific argument. Behaves like Strengthen.
Case-matches-principle. applies a stated principle to a new case. Behaves like Sufficient Assumption.
The trap. misidentifying the subtype before evaluating answers. Read the stem first, label the task, then read the choices.
One mock.Your Principle subtype accuracy, named.
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