Critical thinking test: assumptions, deductions and arguments explained
A critical thinking test measures how well you evaluate information: spotting hidden assumptions, judging whether conclusions really follow, interpreting data and weighing arguments. The Watson Glaser test, widely used by law firms, is the best-known example, and Cappfinity publishes a critical reasoning test used by graduate employers. Each section has a precise answer format, and most marks are lost by answering from general knowledge instead of the text. For related skills, see our deductive reasoning guide.
- Five common sections: inference, assumptions, deduction, interpretation, arguments.
- Assumption test: does the statement collapse without it?
- Deduction: the conclusion must follow necessarily, not just probably.
- Arguments: strong = relevant and important to the question.
- Use only the information given; outside knowledge costs marks.
Free sample question
Critical thinking question
An assumption, deduction, interpretation or argument item, with the reasoning explained.
One question in the real format, with the worked solution · no signup
Quick summary
- Critical thinking tests cover assumptions, inferences, deductions, interpretation and arguments.
- An assumption is made if the statement depends on it.
- A conclusion follows only if it must be true given the information.
- Strong arguments are relevant and important; weak ones are trivial or off-topic.
- Judge only the text in front of you.
The five sections and how to answer them
1. Recognising assumptions
You get a statement and a proposed assumption. Ask: if the assumption were false, would the statement still make sense? If not, the assumption is made.
2. Deduction
Does not follow. "All analysts passed" doesn't mean only analysts passed. This reversal is the most common deduction trap.
3. Inference
You rate how likely an inference is from a passage (true, probably true, insufficient data, probably false, false). "Probably" answers are about reasonable likelihood; use "insufficient data" when the passage doesn't bear on it.
4. Interpretation
Does not follow. 20% is the share of interviewees (10 of 50). The share of applicants is 10 of 200 = 5%.
5. Evaluating arguments
You decide whether an argument for or against a proposal is strong or weak. Strong arguments are directly relevant and important. Weak ones are irrelevant, trivial, personal preferences or exaggerated.
How to prepare
- Learn each section's answer rules: they differ, and mixing them up costs easy marks.
- Practise reading precisely: "some", "all", "only" and "most" change answers.
- Time yourself: these tests feel slow because each item needs careful reading.
If your test is from Cappfinity, see our Cappfinity critical thinking guide.
Practise critical reasoning on forge
Cappfinity-style critical reasoning tests with timed questions and an explanation for every answer.
Start critical reasoning practiceRelated guides
- Deductive reasoning test
- Cappfinity critical thinking
- Cannot Say in verbal reasoning
- Logical reasoning tests
Source notes
The five-section structure reflects common critical thinking test formats, including the Watson Glaser test (Pearson) as described publicly and by candidates. All items are written by forge. Watson Glaser is a trademark of Pearson; forge is independent and not affiliated with Pearson or Cappfinity.
Frequently asked questions
What is a critical thinking test?
A test of how well you evaluate information and arguments: spotting assumptions, judging whether conclusions follow, interpreting data and weighing arguments. The best-known example is the Watson Glaser test, widely used by law firms. Cappfinity also publishes a critical reasoning test.
What sections are in a critical thinking test?
Common sections are inference, recognising assumptions, deduction, interpretation and evaluating arguments. Each has its own answer format, such as 'assumption made / not made' or 'strong / weak argument'.
How do I spot assumptions?
Ask what must be true for the statement to make sense. If the statement collapses without it, it's an assumption made. If the statement still works, the assumption isn't made.
What makes an argument strong in a critical thinking test?
It must be relevant to the question and important. Strong arguments give a real reason that bears directly on the issue; weak arguments are irrelevant, trivial, personal preferences or wild exaggerations.
Does forge have critical thinking practice?
Yes. forge has Cappfinity-style critical reasoning tests with timed questions and explanations, and this page has a free 10-question game covering assumptions, deductions and arguments.
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