What Is the Watson Glaser Test? The Law-Firm Screen Explained

The Watson Glaser Critical Thinking Appraisal is a 40-question, 30-minute test published by Pearson that measures how well you reason from written information. Rather than testing knowledge, it scores three skills Pearson calls the "RED model": recognizing assumptions, evaluating arguments, and drawing conclusions. The test is best known as the gatekeeper of legal hiring. Law firms including Linklaters, Clifford Chance, and Hogan Lovells use it to screen applicants, and results are reported as percentiles against a norm group, with no universal pass mark.

The test traces back to work begun in the 1920s by the psychologists Goodwin Watson and Edward Glaser, which makes it one of the oldest continuously used assessments in hiring. Its classic structure spans five exercises: inference, recognition of assumptions, deduction, interpretation, and evaluation of arguments. The modern revision folds those into the three RED dimensions, each reported as its own subscore alongside the overall result.

What makes the test distinctive is its discipline about evidence. Items present a passage and ask what follows from it, under the test's own strict definitions of terms like "probably true." Importing outside knowledge, the reflex the test is designed to catch, produces wrong answers. The skill being measured is closely related to the deductive side of logical reasoning, applied to arguments written in ordinary prose.

• 40 items, 30 minutes: The standard configuration is 40 questions with a 30-minute limit, delivered online. An untimed version exists for development use and accommodations.

• Passage-based sections: In the second-edition forms, the 40 items break down as 12 recognize-assumptions, 12 evaluate-arguments, and 16 draw-conclusions questions.

• Item-banked forms: Questions are drawn from a large bank of business-relevant items, so parallel forms exist and candidates do not all see identical papers.

• No legal content: Despite its law-firm reputation, the test requires no legal knowledge at all.

Employers receive an overall score, subscores on the three RED dimensions, and a percentile that places the candidate against a chosen norm group, such as managers, graduates, or specific professions. Pearson publishes no pass mark; each employer sets its own benchmark. The test's psychometrics are solid for a 40-item instrument: Pearson reports internal consistency of .83, test-retest reliability between .73 and .89, and correlations with job performance indicators ranging from .16 to .58 depending on the role and criterion.

It is closer to one than its branding suggests. In Pearson's own validation data for the second edition, total scores correlated in the low-to-mid .60s with Full Scale IQ on the WAIS-IV, the standard adult intelligence test, and about .67 with its fluid-reasoning composite. Critical thinking as the Watson Glaser defines it draws heavily on the same general reasoning ability an IQ test measures, filtered through careful reading. The overlap is why strong performers on verbal reasoning tasks tend to find the test familiar.

The difference is scope. The Watson Glaser samples one region of cognitive ability, reasoning about written arguments, and reports it against hiring norms. A full-length intelligence test such as the RIOT IQ test (the Reasoning and Intelligence Online Test) measures reasoning alongside spatial, memory, and speed abilities and reports a calibrated IQ with a stated margin of error. If a Watson Glaser invitation has you wondering about your broader profile, you can take the free RIOT IQ test for a fast baseline.

Preparation genuinely helps on this test, not because the reasoning can be memorized but because the answer rules are unusual. The University of Oxford's careers service advises candidates to practice with format-faithful materials and to learn the test's internal definitions, such as exactly how certain a statement must be to count as "probably true." Two habits matter most: answer only from the passage, never from what you happen to know, and treat each section's instructions as a rulebook to apply mechanically. Retake windows are set by the employer, so a rejected application usually means waiting for the next recruitment cycle.

No. The passages are business-relevant prose, and legal knowledge provides no advantage. Law firms use the test precisely because it measures reasoning rather than learned content.

Whatever clears the percentile benchmark the employer sets against its chosen norm group. Pearson publishes no universal cutoff, and firms do not disclose theirs.

The items are not exotic, but the required discipline is. Most wrong answers come from importing outside knowledge or applying everyday standards of proof instead of the test's definitions.

Retesting is the employer's call. Firms typically ask unsuccessful applicants to wait until the next application cycle rather than offering an immediate retake.

The standard version is timed at 30 minutes, but an untimed version exists for accommodations and development settings, so requirements can vary by employer.

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4. University of Oxford Careers Service. (n.d.). How to prepare for and pass the Watson Glaser test. careers.ox.ac.uk

5. Pearson TalentLens. (n.d.). Watson-Glaser critical thinking test [Product page]. talentlens.com