What does the AQA A-Level Philosophy epistemology module cover?

Epistemology (section 4.1.1) is the theory of knowledge. It has four parts: what knowledge is (the tripartite justified true belief definition, Gettier cases and the responses), perception and whether it gives us the external world (direct realism, indirect realism and Berkeley's idealism), the origin of concepts and knowledge (the rationalism versus empiricism debate, innate ideas, the a priori and the analytic and synthetic distinctions), and the limits of knowledge through philosophical scepticism, especially Descartes' three waves of doubt.

How is epistemology examined in AQA A-Level Philosophy?

Epistemology is examined in Paper 1 alongside moral philosophy. Questions range from short three and five mark explain questions to twelve and twenty-five mark essays that require you to explain a position, advance arguments and objections, and defend a clear evaluative conclusion. The set philosophers and named arguments must be accurate; vague paraphrase loses marks.

What is the difference between rationalism and empiricism here?

Empiricists (Locke, Hume) hold that all concepts and all substantive knowledge of the world come from sense experience, so the mind is a tabula rasa and there is no synthetic a priori knowledge. Rationalists (Descartes, Plato) hold that some concepts are innate and some substantive truths can be known a priori through intuition and deduction. The debate runs through the origin of concepts, the a priori and the four analytic, synthetic, a priori and a posteriori distinctions.

Why do Gettier cases matter so much?

Gettier cases are short examples in which a belief is true, believed and justified, yet intuitively not knowledge because it is true only by luck. They appear to refute the tripartite justified true belief definition by showing the three conditions are not jointly sufficient. The responses (infallibilism, no false lemmas, reliabilism and virtue epistemology) are a reliable source of essay questions.

How should I revise the epistemology module?

Learn each named position and its set arguments precisely, then drill the standard objections and replies for each. Build comparison tables (for example direct realism versus indirect realism versus idealism, or empiricism versus rationalism) and practise turning them into evaluative paragraphs with a defended conclusion. Use the exact terminology AQA expects, such as sense-data, esse est percipi, the copy principle and the evil demon.

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AQA A-Level Philosophy 4.1.1 Epistemology: a complete overview of knowledge, perception, concept origins and scepticism

A deep-dive AQA A-Level Philosophy guide to the epistemology module (4.1.1). Covers the definition of knowledge and Gettier, theories of perception, the origin of concepts and knowledge in the rationalism versus empiricism debate, and the limits of knowledge through philosophical scepticism, with the named philosophers and arguments examiners expect.

Generated by Claude Opus 4.822 min read4.1.1Updated 2026-06-02

Reviewed by: AI editorial process; not yet individually human-reviewed

Jump to a section

What the epistemology module demands
What is knowledge?
Perception and the external world
The origin of concepts and knowledge
The limits of knowledge: scepticism
How epistemology is examined
Check your knowledge

What the epistemology module demands

Epistemology is the theory of knowledge, and module 4.1.1 asks four linked questions: what is knowledge, does perception reach an external world, where do our concepts and knowledge come from, and how far can scepticism be pushed. The examiners test two skills: precise recall of named positions and their set arguments, and the ability to weigh those arguments against objections to reach a defended conclusion.

This guide walks through all four topics in specification order and shows how they connect, then sets out the exam patterns AQA repeats. Each topic has a matching dot-point page with practice questions; this overview ties them together.

What is knowledge?

The module opens with propositional knowledge ("knowing that") and the tripartite definition: knowledge is justified true belief (JTB), traced to Plato's Theaetetus, with each condition claimed to be individually necessary and jointly sufficient. Gettier (1963) cases show all three conditions can be met by a belief that is true only by luck, so JTB is not sufficient. The set responses are infallibilism, the no false lemmas condition, reliabilism, and virtue epistemology (Zagzebski, Sosa), each with its own counterexamples such as the fake barn case.

Perception and the external world

The second topic compares three theories of perception. Direct realism says we perceive mind-independent objects immediately; indirect realism (Locke) says we perceive them indirectly via mind-dependent sense-data; and Berkeley's idealism denies mind-independent matter, holding that esse est percipi and that objects are collections of ideas sustained by God. The arguments from perceptual variation, illusion, hallucination and time-lag push direct realism towards indirect realism, which then faces the veil of perception. Locke's primary and secondary qualities and Russell's best-hypothesis argument are the key responses.

The origin of concepts and knowledge

The third topic is the rationalism versus empiricism debate. Empiricists (Locke's attack on innate ideas and the tabula rasa, Hume's copy principle of impressions and ideas, with the missing shade of blue) hold that all concepts and substantive knowledge come from experience. Rationalists argue for innate concepts and for a priori knowledge through intuition and deduction (Descartes), with Plato's Meno slave boy. Running through it are the four distinctions: analytic and synthetic, a priori and a posteriori, and whether there is synthetic a priori knowledge, with Hume's fork denying it.

The limits of knowledge: scepticism

The final topic distinguishes philosophical scepticism from ordinary doubt, and local from global scepticism, and explains the constructive role of scepticism in epistemology. Descartes' three waves of doubt (the unreliable senses, the dreaming argument, and the evil demon) drive towards near-global doubt, after which he rebuilds from the cogito and a non-deceiving God. Responses include the worry of the Cartesian circle, the thinness of the cogito, and reliabilist or externalist replies that reject the demand for internal certainty.

How epistemology is examined

A typical AQA profile for this module:

Short explain questions (3 and 5 marks). State the tripartite conditions, explain the argument from illusion, define analytic and synthetic, or outline the dreaming argument.
Five mark application and outline. Explain how a Gettier case works, or outline Hume's copy principle, with precise terminology.
Twelve mark evaluation. Briefly assess a single argument or objection, such as whether reliabilism solves the Gettier problem.
Twenty-five mark essays. Sustained evaluation, for example "Is knowledge justified true belief?" or "Can perception give us knowledge of the external world?", requiring a clear, defended conclusion.

Check your knowledge

A mix of recall and short evaluation questions covering module 4.1.1. Attempt them under timed conditions, then check against the solutions.

State the three conditions of the tripartite definition of knowledge. (3 marks)
Explain how a Gettier case is meant to refute the tripartite definition. (5 marks)
Outline the argument from illusion against direct realism. (5 marks)
Explain Berkeley's claim that esse est percipi. (3 marks)
Explain Hume's copy principle. (5 marks)
Define the analytic and synthetic distinction with an example of each. (4 marks)
Outline Descartes' three waves of doubt. (5 marks)
Explain the difference between local and global scepticism. (3 marks)

Solutions

Q1: Knowledge is justified true belief: the proposition must be true, the subject must believe it, and the subject must be justified in believing it; each condition is necessary and the three are claimed jointly sufficient.
Q2: Describe a case (for example Smith and the ten coins, or the stopped clock) where the belief is true, believed and justified but true only by luck. Since we deny it is knowledge, JTB is not sufficient.
Q3: A straight stick looks bent in water, so we are immediately aware of something bent; but the stick is not bent, so the immediate object of perception is a sense-datum, not the mind-independent object, against direct realism.
Q4: For sensible objects, to exist is to be perceived; objects are collections of ideas, and they continue to exist unperceived by us because they are always perceived by God.
Q5: Every idea is a faint copy of a prior impression (a vivid sensation or feeling); complex ideas are built by combining simple ideas that each trace back to impressions, so a concept with no corresponding impression is empty.
Q6: Analytic: true in virtue of the meanings of its terms (all bachelors are unmarried). Synthetic: truth depends on how the world is (the door is open).
Q7: First, the senses sometimes deceive, so individual perceptions are doubtful. Second, the dreaming argument: no certain mark distinguishes waking from dreaming. Third, the evil demon, which casts doubt even on simple a priori truths such as mathematics.
Q8: Local scepticism doubts knowledge in a single domain (such as the external world); global scepticism threatens all, or nearly all, knowledge.

Sources & how we know this

AQA A-level Philosophy (7172) specification — AQA (2017)