Apply the
Principle

Master the art of identifying abstract rules and applying them to new situations: a critical LSAT Logical Reasoning skill.

LSAT Logical Reasoning

What Is a Principle?

On the LSAT, a principle is a broad, general rule that governs how specific situations should be evaluated. Think of it as an if-then guideline that can be applied across many different scenarios.

Two Directions of Principle Questions

Principle → Application

You are given a general rule in the stimulus. You must find which answer choice scenario conforms to (or violates) that rule.

Situation → Principle

You are given a specific scenario in the stimulus. You must find which answer choice states the general rule that justifies the reasoning.

Why This Skill Matters

"Apply the Principle" questions test your ability to think abstractly. Instead of analyzing one argument, you must translate a general rule into concrete terms and verify that every condition is satisfied in a new context.

The Core Rule of Apply the Principle

The principle in the stimulus always has multiple components. Your job is to break those components apart and verify that the correct answer choice addresses each one. Partial matches are designed to lure you.

Anatomy of a Principle Statement

Apply vs. Parallel Reasoning

	Apply the Principle	Parallel Reasoning
Stimulus gives you	A general rule	A specific argument
You must find	A scenario that fits the rule	An argument with the same structure
Focus	Content match: do the facts satisfy the conditions?	Structural match: is the logical form identical?
Common trap	Partial condition match	Same topic, different structure

How to Apply the Principle: Step by Step

1

Read the principle carefully. Identify the IF condition(s) and the THEN conclusion. Note every qualifier.

2

Paraphrase in your own words. Restate the principle simply: "Whenever X happens under Y circumstances, Z follows."

3

Scan each answer choice. For each one, ask: does this scenario contain the condition? Does it reach the conclusion?

4

Eliminate partial matches. If even one element of the condition is missing, that choice is wrong.

5

Confirm the winner. The correct answer satisfies ALL conditions and reaches the matching conclusion.

Worked Example 1: Setup

Let's break this down using our anatomy framework:

Condition

Speech directly incites violence against a specific group

Conclusion

Government may restrict the speech (and should NOT restrict it otherwise)

Worked Example 1: Application

Which scenario conforms to the principle?

✕ Trap Answer

"The city banned a protest that criticized the mayor harshly but did not incite violence." This fails: the condition (inciting violence) is not met, so the government should not restrict.

✓ Correct Answer

"The city allowed a rally even though it contained offensive slogans, because the slogans did not incite violence against any group." Condition not met → no restriction: conforms.

Worked Example 2: Multi-Condition

This principle has two conditions joined by "and": both must be satisfied for the obligation to apply. Let's test two scenarios:

Scenario A

Maria sees a drowning child in a raging river while a lifeguard stands nearby. Risk is high, and someone else is better positioned. Neither condition met: no obligation.

Scenario B

Tom sees someone collapse on an empty street. No risk to Tom; no one else around. Both conditions met: Tom is obligated to help.

Worked Example 3: The Qualifier Trap

The key qualifier here is "know to be unverified." If the journalist genuinely believed the information was verified, the principle does NOT apply, even if the information was actually false.

Common Mistakes

✕ Ignoring Qualifiers

Words like "knowingly," "only if," or "always" change the scope entirely. Skipping them leads to selecting answers where the condition isn't truly met.

✕ Partial Condition Match

If a principle requires conditions A AND B, an answer satisfying only A is wrong. Both must be present. Don't stop checking early.

✕ Reversing the Direction

Confusing "If X, then Y" with "If Y, then X." The principle states a specific direction of reasoning: condition → conclusion, not the reverse.

Quick-Reference Checklist

Step	Action	Key Question
1	Identify principle structure	What are the IF and THEN parts?
2	Note all qualifiers	"Always," "only if," "knowingly"?
3	Paraphrase simply	Can I restate this in one sentence?
4	Test each answer	Does this scenario satisfy ALL conditions?
5	Check conclusion direction	Does the outcome match the principle's THEN?

Time to Practice

You'll now face 5 assessment questions that mirror real LSAT "Apply the Principle" items. For each one, read the principle carefully, identify the conditions, and find the answer that best conforms.

Question 1 of 5

Principle: An employer acts unjustly if the employer disciplines an employee for conduct that the employer's own policies do not explicitly prohibit.

▼ Tap to read full passage

Which of the following most closely conforms to the principle above?

The principle states that discipline for conduct not explicitly prohibited by policy is unjust. Choice B describes discipline (suspension) for conduct (casual clothing) with no written policy against it: all conditions are met. Choice C involves conduct that IS prohibited: the principle doesn't apply. Choice D involves conduct that IS covered by policy: the warning is just, not unjust.

Question 2 of 5

Principle: A reviewer is being dishonest if the reviewer gives a negative assessment of a work solely because of a personal dislike for the creator, rather than based on the merits of the work itself.

▼ Tap to read full passage

Which of the following judgments most closely conforms to the principle?

The principle requires: (1) a negative assessment, (2) motivated solely by personal dislike, (3) not based on merits. Choice C satisfies all three: the review was negative, driven by a personal grudge, and the film actually had strong qualities. Choice A fails because the critic gave a positive assessment. Choice B involves a positive review and friendship, not a negative one driven by dislike.

Question 3 of 5

Principle: It is unethical for a scientist to present the findings of preliminary research as if they were conclusive, unless the scientist clearly discloses the preliminary nature of the results to the audience.

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Which of the following situations involves unethical behavior according to the principle?

The principle says: presenting preliminary research as conclusive is unethical, UNLESS the preliminary nature is disclosed. Dr. Patel (A) presents early data as "definitive proof" without disclosure: all conditions met, so this is unethical. Dr. Kim (B) discloses the preliminary nature: the exception applies, so it's ethical. Dr. Reyes (C) presents a completed, peer-reviewed study: this isn't preliminary, so the principle doesn't apply.

Question 4 of 5

Principle: A charitable organization should not use more than \(25\%\) of its donations for administrative costs. Any organization that does so is failing in its duty to its donors.

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Which of the following, if true, would represent a failure of duty according to this principle?

The principle specifies that more than \(25\%\) of donations going to administrative costs constitutes a failure of duty. Choice D: \(40\%\) of donations go to administrative overhead (salaries, rent): this exceeds \(25\%\), so it's a failure. Choice B is a trap: \(30\%\) of total revenue goes to admin, but only \(15\%\) of donations do. The principle specifies donations, not total revenue. Choice C involves fundraising, not administrative costs.

Question 5 of 5

Principle: A teacher is justified in departing from the standard curriculum only if (1) the departure is intended to address a demonstrated learning gap among students, and (2) the teacher has obtained prior approval from the school administration.

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In which of the following cases is the teacher's departure from the curriculum NOT justified according to the principle?

The principle requires both conditions: (1) a demonstrated learning gap, and (2) prior administrative approval. Ms. Chen (B) fails on both: "bored" is not a demonstrated learning gap, and she did not obtain approval. Choices A, C, and D all satisfy both conditions: each involves a documented learning need and administrative sign-off.

Apply thePrinciple

What Is a Principle?

Two Directions of Principle Questions

Why This Skill Matters

The Core Rule of Apply the Principle

Anatomy of a Principle Statement

Apply vs. Parallel Reasoning

How to Apply the Principle: Step by Step

Worked Example 1: Setup

Worked Example 1: Application

Worked Example 2: Multi-Condition

Worked Example 3: The Qualifier Trap

Common Mistakes

Quick-Reference Checklist

Time to Practice

Question 1 of 5

Question 2 of 5

Question 3 of 5

Question 4 of 5

Question 5 of 5

Apply the
Principle