Strengthen questions reward a specific mental discipline: reading an argument and instantly feeling where it's weak. Unlike Reading Comprehension, where you're absorbing information, here you're a critic looking for the crack in the reasoning — because that crack is exactly where the right answer will apply pressure. Master this instinct and you'll pick up not just Strengthen points but Weaken, Assumption, and Flaw points too, since they all key off the same gap.

What Strengthen Questions Test

Every LSAT argument moves from premises (evidence) to a conclusion. The move is almost never airtight — there's a logical jump, a gap, an unstated assumption holding the whole thing together. Strengthen questions test whether you can spot that gap and recognize which new fact would shore it up.

Crucially, you are not being asked to prove the conclusion. You're being asked to make it more likely. An answer that takes the argument from 40% believable to 55% believable does the job. This is why 'strengthen' is a matter of degree, and why you should never eliminate an answer just because it fails to nail the conclusion down completely.

The underlying skill — seeing the distance between what's proven and what's concluded — is the single most transferable ability on the Logical Reasoning sections. Build it here and everything else gets easier.

How to Recognize Them

Strengthen question stems ask you to add support. Watch for language like:

• "Which one of the following, if true, most strengthens the argument?"
• "Which one of the following, if true, most supports the reasoning above?"
• "The argument would be most strengthened if which one of the following were true?"
• "Which one of the following, if established, provides the most support for the conclusion?"

The phrase "if true" is the tell. It signals that you must accept the answer as fact and evaluate its effect on the argument — you don't get to question whether the answer is accurate. Note the mirror image: swap "strengthens" for "weakens" or "undermines" and you have the opposite question type. The method is identical; only the direction flips.

The Method

Run these steps every time. With practice they collapse into a few seconds.

1. Find the conclusion first. Underline it. Everything else in the stimulus is either premise or noise. If you strengthen the wrong claim, you lose the point.
2. Identify the premises. What evidence is actually offered? Separate the support from the claim.
3. Find the gap. Ask: "What has to be true for this evidence to lead to this conclusion?" That unstated bridge is the assumption. The right answer will almost always relate to it. Pay special attention to new terms that appear in the conclusion but not the premises — that shift in language is where gaps hide.
4. Prephrase. Before touching the answers, predict what kind of fact would help — usually: confirm the assumption, eliminate a competing explanation, or supply a missing link.
5. Test each answer with one question: "If this were true, does the conclusion become more likely?" If yes, keep it. If it's irrelevant or points the other way, cut it.
6. Compare survivors by degree. The credited answer helps most. When two answers both help, pick the one that closes the central gap most directly.

The Common Traps

Wrong answers on Strengthen questions follow predictable patterns. Learn to name them on sight.

• Strengthens a premise, not the conclusion. The most seductive trap. An answer reinforces evidence the argument already stated — but the premise wasn't in doubt. You need the answer to help the logical move from premise to conclusion, not to pile on the premise.
• Out of scope. The answer discusses something adjacent but not actually part of the argument's chain. It sounds relevant; it isn't. Always tie the answer back to the exact conclusion.
• Weakens instead. On a hard question, the trap answer is often the perfect weaken answer. If you rushed the stem, you'll grab it. Slow down and confirm the direction.
• True but inert. The answer is a fact you'd happily accept, but it changes nothing about how likely the conclusion is. "Interesting" is not "strengthens."
• Extreme reversal. An answer that goes so far it actually restates or assumes the conclusion, or introduces a condition so strong it distorts the argument. Watch quantifiers.
• Right idea, wrong subject. The answer strengthens a claim about the wrong group, time period, or category — close, but a subtle scope shift from the conclusion.

Worked Example

The following is an original question written in the style of the LSAT.

Stimulus: A city installed brighter streetlights along its downtown corridor last year. In the twelve months since, reported nighttime pedestrian injuries in that corridor fell by 30 percent. City officials concluded that the brighter lighting caused the drop in injuries.

Question: Which one of the following, if true, most strengthens the officials' argument?

Step 1 — Conclusion: The brighter lighting caused the drop in injuries. This is a causal claim.

Step 2 — Premises: Lights were made brighter; injuries fell 30 percent afterward.

Step 3 — The gap: Causal arguments always have the same vulnerability — something else could explain the drop. Maybe fewer people walked downtown at night. Maybe the city also added police patrols. The argument assumes no alternative cause accounts for the decline. To strengthen a causal conclusion, we typically want to rule out an alternative explanation or show the cause-and-effect pattern holds up.

Step 4 — Prephrase: An answer showing that other relevant factors stayed constant, or that injuries didn't drop where lighting wasn't changed, would help.

The credited answer: "In a neighboring corridor where lighting was not changed, nighttime pedestrian injuries remained roughly constant over the same twelve months." This is a controlled comparison — it rules out a citywide trend (like fewer pedestrians overall) as the cause, isolating the lighting as the difference. That's exactly the kind of alternative-explanation elimination that strengthens a causal claim.

Notice how a trap answer might read: "The new streetlights consume less energy than the old ones." True, plausibly, and completely irrelevant to whether brightness reduced injuries. Inert.

A Few to Try

Original Lovare practice questions in LSAT style. Try each before reading the explanation.

Work them under the method above: conclusion, premises, gap, prephrase, then test. Full stems, answer choices, and explanations are provided in the practice section below.

How to Drill This Type

Strengthen questions improve fastest when you drill by type, not by random test order. Here's a plan:

1. Drill in sets of 10. Do ten Strengthen questions in a row, untimed at first. Concentration on one type trains your gap-spotting reflex.
2. Prephrase every time. Force yourself to write a one-line prediction before looking at answers. This is the single highest-leverage habit for the type.
3. Log the traps. For every wrong answer you almost picked, name the trap (strengthens-a-premise, out-of-scope, etc.). Patterns emerge within a week.
4. Review right answers too. Understand why the credited answer beat your second choice by degree.
5. Then add timing. Aim for roughly 1:20 per Logical Reasoning question. Speed comes from recognition, not rushing.

For real, scored official questions, use LSAC's official LawHub, which gives you access to genuine PrepTests. Do Lovare's original drills to build the skill, and calibrate against official LawHub material to confirm you're ready for the real thing. Remember the current format: two scored Logical Reasoning sections and one scored Reading Comprehension section — Strengthen questions appear throughout the LR sections.