Watson-Glaser Critical Thinking Appraisal Practice Test

Watson-Glaser Critical Thinking Appraisal Practice Test

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Watson Glaser Deduction — How to Apply Strict Logic

The Watson Glaser Deduction test is one of five sections of the Watson Glaser Critical Thinking Appraisal (WGCTA). It measures your ability to draw logical conclusions from a set of statements — a skill heavily tested in law firm assessments, management consulting recruitment, and graduate hiring. This guide breaks down exactly what the deduction section tests, how to approach each question type, and the strategies used by top scorers.

What the Deduction Section Tests

The Watson Glaser Deduction section presents you with a short set of premises — statements you must accept as true — followed by a conclusion. Your job is simple in theory: decide whether the conclusion Follows or Does Not Follow strictly and necessarily from the premises.

This is not a general-knowledge test. It is not asking whether the conclusion is true in the real world. It is asking whether, given only the information in the premises, the conclusion is logically required. If you can construct even one scenario where the premises are true but the conclusion is false, the answer is Does Not Follow.

The section typically contains 5 items in the standard Watson Glaser format, and it is consistently the section where candidates make the most errors. Why? Because human brains are wired to use prior knowledge. Formal deductive logic demands you switch that wiring off.

For a full overview of all five sections of the test, see the Watson Glaser Critical Thinking Test — Complete Guide 2026. If you want to practise inference questions alongside deduction, visit Watson Glaser Inference — How to Master the Hardest Section.

Follows vs Does Not Follow — The Core Distinction

The Watson Glaser scoring guide defines the two answer choices precisely:

Notice that probable is not enough. A conclusion that is likely to be true, plausible, or sensible in the real world still receives Does Not Follow if it is not necessarily true given the premises. This is the trap that costs most candidates marks.

Test yourself on real questions at the Watson Glaser Practice Test 2026 after working through the examples below.

The Four Statement Types and How to Reason Through Each

check-circle All Statements (Universal Affirmative)

"All A are B" means every single member of group A belongs to group B — no exceptions. From this you can safely conclude that any specific member of A is also B. You cannot conclude that all B are A (that would be the converse fallacy). Example: "All lawyers passed the bar exam. Sarah is a lawyer." → "Sarah passed the bar exam" Follows. → "Everyone who passed the bar exam is a lawyer" Does Not Follow.

minus-circle Some Statements (Particular Affirmative)

"Some A are B" tells you only that at least one member of A is also B. You cannot conclude anything about the rest of A, nor can you conclude that any specific A you are given is necessarily B. This is the most dangerous type — candidates routinely over-read "some" as "most" or assume it transfers to a named individual. Stick strictly to what the word "some" logically permits.

x-circle No Statements (Universal Negative)

"No A are B" means zero overlap between the two groups — ever. From this you can always validly reverse direction: if no A are B, then no B are A. This is the one universal negative where the converse holds. You can also conclude that any specific A is not B and any specific B is not A. Do not confuse this with "Some A are not B", which is a much weaker statement.

arrow-right-circle If-Then Statements (Conditional)

"If P then Q" means whenever P is true, Q must be true. Two valid moves: (1) Modus Ponens — P is true, therefore Q is true. (2) Modus Tollens — Q is false, therefore P is false. Two invalid moves (classic traps): Affirming the consequent — Q is true, therefore P is true (wrong). Denying the antecedent — P is false, therefore Q is false (wrong). These two invalid moves appear frequently in Watson Glaser Deduction items.

Worked Examples and Common Errors

Example 1 — The Real-World Knowledge Trap

Premises: All members of the senior leadership team have completed the compliance training. James has not completed the compliance training.

Conclusion: James is not a member of the senior leadership team.

Answer: Follows. This is a valid Modus Tollens: if all SLT members completed training and James has not, James cannot be in the SLT. Notice this works purely from the premises — no outside knowledge is needed or used.

Example 2 — The "Some" Trap

Premises: Some project managers in the company hold a PMP certification. Alex is a project manager in the company.

Conclusion: Alex holds a PMP certification.

Answer: Does Not Follow. "Some" project managers hold PMP — not all. Alex could be one of those who does not. The premises give no specific information about Alex's certification status. Candidates who know that PMP is common among experienced PMs may be tempted to mark Follows — that is real-world knowledge contaminating the logic.

Example 3 — The Converse Fallacy

Premises: No candidates who scored below 70 were offered a position. Miranda was offered a position.

Conclusion: Miranda scored 70 or above.

Answer: Follows. "No below-70 candidates were offered" means all offered candidates scored 70+. Miranda was offered, so she scored 70+. This is a valid application of the universal negative conversion.

Example 4 — If-Then Affirming the Consequent (Trap)

Premises: If an employee passes the probation review, they receive a permanent contract. Chen received a permanent contract.

Conclusion: Chen passed the probation review.

Answer: Does Not Follow. The premises say passing the review leads to a permanent contract — but they do not say a permanent contract can only come from passing the review. Chen may have received it through another route. This is the affirming-the-consequent fallacy. Candidates find this difficult because in most workplaces the scenario seems obvious. Ignore what you know about workplaces.

For tips on approaching the test as a whole, including how to manage time across all five sections, see Watson Glaser Test: 7 Tips to Know to Pass Your Assessment.

The One Rule That Changes Everything
Ignore everything you know about the world. Judge conclusions only from the premises given. It does not matter whether the conclusion seems true, sensible, or obvious from experience. If the premises do not logically require it, the answer is Does Not Follow. Full stop. This single rule is responsible for the majority of marks lost on the Watson Glaser Deduction section. Candidates who master this rule — truly internalise it, not just recite it — consistently outscore those who rely on domain knowledge.

Deduction Mastery Checklist — 8 Steps

Read all premises slowly and accept them as absolutely true, even if they contradict your knowledge.
Identify the statement type: All / Some / No / If-Then — different rules apply to each.
Before reading the conclusion, ask yourself: what can I validly derive from these premises?
Read the conclusion and check: is this one of the things I could derive? Or does it require extra information?
For 'All' statements: check for the converse fallacy before marking Follows.
For 'Some' statements: never infer anything about a specific named individual unless the premise names them.
For 'If-Then' statements: write out the four moves (Ponens, Tollens, Consequent, Antecedent) mentally and confirm which apply.
If you catch yourself thinking 'but in real life…' — stop immediately and return to the premises only.

What is the Watson Glaser Deduction section?

The Deduction section presents a set of premises followed by a conclusion. You must decide whether the conclusion Follows or Does Not Follow strictly from the premises using formal logic alone — not real-world knowledge. It typically contains 5 items and is one of the five sections of the Watson Glaser Critical Thinking Appraisal.

What is the difference between Follows and Does Not Follow?

Follows means the conclusion is logically required by the premises with no additional assumptions. Does Not Follow means the conclusion either needs extra information not in the premises, is contradicted by the premises, or is only probable rather than certain. Probable is never enough — the conclusion must be logically necessary.

Why do candidates get deduction questions wrong?

The most common error is injecting real-world knowledge into the reasoning. Candidates mark a conclusion as Follows because it seems true from experience, not because the premises require it. Other frequent errors include the converse fallacy with All statements, over-reading Some statements, and affirming the consequent in If-Then questions.

Can a conclusion be true but still Does Not Follow?

Yes — and this is the key insight. A conclusion can be factually true in the real world but still receive Does Not Follow if the premises do not logically compel it. The test measures your ability to reason from given information, not your general knowledge. If you need information beyond the premises to confirm the conclusion, the answer is Does Not Follow.

How do I handle If-Then premises in the Deduction section?

Accept only two valid moves: Modus Ponens (if P then Q, P is true → Q is true) and Modus Tollens (if P then Q, Q is false → P is false). Reject two common fallacies: affirming the consequent (Q is true → P is true) and denying the antecedent (P is false → Q is false). Both fallacies appear as traps in Watson Glaser items.

How many questions are in the Watson Glaser Deduction section?

The standard Watson Glaser format includes 5 deduction items as part of a 40-item test (sometimes 80 items in extended formats). The full test covers five sections: Inference, Recognition of Assumptions, Deduction, Interpretation, and Evaluation of Arguments. Each section requires a distinct reasoning approach.
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