Watson-Glaser Critical Thinking
Formal logical analysis — not just comprehension.
What it is
The Watson-Glaser Critical Thinking Assessment requires formal logical analysis across five sub-tests. Unlike verbal reasoning, it evaluates whether conclusions follow necessarily from given premises — candidates must distinguish 'definitely true' from 'probably true', and recognise hidden assumptions. The standard version runs 80 questions in 40 minutes; a half-time variant is also used.
Who uses it
All Magic Circle law firms: Clifford Chance, Linklaters, Allen & Overy, Freshfields, Slaughter and May
Solicitor training contract applications at most UK top-30 law firms
Some Big 4 firms and management consulting practices
Graduate schemes where critical reasoning is a core competency
What it tests
Inferences: whether a conclusion follows necessarily from stated facts, or is merely probable
Recognition of Assumptions: spotting what the author has taken for granted without stating it
Deduction: whether a conclusion can be drawn logically from the premises given
Interpretation: whether conclusions follow beyond reasonable doubt from the evidence
Evaluation of Arguments: distinguishing strong arguments from weak or irrelevant ones
Common mistakes
Treating it like verbal reasoning
Watson-Glaser requires formal logic, not just comprehension. The question is not 'does this seem consistent with the passage?' but 'does this follow necessarily from the premises?'
Confusing degrees of truth
The test distinguishes 'True', 'Probably True', 'Insufficient Data', 'Probably False', and 'False'. 'Probably True' is not the same as 'True' — be precise.
Ignoring hidden assumptions
In the Assumptions sub-test, the key question is: 'Is this assumption required for the argument to hold?' If the argument could work without it, it is not assumed.
Rushing the Evaluation of Arguments section
A strong argument is both logically relevant and important to the question. Length and confidence in tone are not indicators of strength.
How to prepare
Download and complete the official Pearson Watson-Glaser sample test — it is the most accurate representation of the real format.
Study each of the five sub-test types separately before attempting full timed tests; they require different mental stances.
Critical Thinking Web (hku.hk) has free logic exercises that build the formal reasoning skills Watson-Glaser demands.
Practice distinguishing 'follows necessarily' from 'is consistent with' — this single distinction accounts for the majority of errors.
Aim for at least three full practice attempts under timed conditions before your real test.
Free resources
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