On what grounds might we doubt a claim?
TOK Exhibition Prompt 4 — Object Examples & Rationale
A complete, examiner-written breakdown of IB TOK Exhibition IA Prompt 4 — five worked object examples, linked optional themes, knowledge questions and top-band commentary to help you nail the TOK exhibition for IB DP May 2026.
The Prompt
“On what grounds might we doubt a claim?” — Prompt 4 of the 35 prescribed IA prompts.
Assessment Weight
TOK exhibition = one-third of your final TOK grade.
Word Count
950 words max across all 3 objects combined (plus references).
Session
Updated & mapped for TOK assessment.
Decoding Prompt 4 – “On what grounds might we doubt a claim?”
IB TOK Exhibition Prompt 4 asks an essential epistemological question: on what grounds might we doubt a claim? Not all claims deserve equal credence — and knowing when and why to doubt is a fundamental part of rigorous thinking. Your three objects must each illustrate a different category of legitimate grounds for doubt: logical inconsistency, empirical contradiction, source unreliability, motivated bias, or structural issues with how the claim was produced.
A top-band exhibition on Prompt 4 demonstrates three distinct grounds for doubt rather than three examples of the same ground. The best exhibitions distinguish between doubting claims and doubting claimants, between logical challenges and evidential ones, and between productive scepticism and corrosive cynicism. Rich examples come from the natural sciences, history, and knowledge & language.
TOK Exhibition Objects for Prompt 4
Each example below includes the object, linked optional theme, examiner-written rationale, and a knowledge question to extend your analysis.
A Retracted Scientific Paper
A printed notice of a retracted scientific paper — with the word “RETRACTED” stamped across the title — represents the clearest case of legitimate doubt grounded in methodology. Papers are retracted when investigators discover data fabrication, statistical errors, undisclosed conflicts of interest, or irreproducibility. The act of retraction is the scientific community formally stating that the claim should no longer be cited as knowledge. This object demonstrates one of the most important grounds for doubt: a claim can be doubted when the process that produced it is revealed to be flawed, even if the claim sounds plausible. The retraction itself is a piece of meta-knowledge — knowledge about how to evaluate knowledge. Science, by building retraction into its practice, acknowledges that doubt is integral to its operation: no finding is permanently beyond question, and every paper carries the implicit caveat that future scrutiny might reveal errors invisible today. This invites reflection on the unusual strength of scientific knowledge precisely because it institutionalises its own doubt.
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A Historical Propaganda Poster
A reproduction of a wartime propaganda poster — whether Soviet, Nazi, American or otherwise — illustrates how the motivations of the source can ground legitimate doubt about claims. Propaganda makes claims about enemies, national virtues, historical causes and future outcomes, but it is produced by institutions with explicit political objectives. A claim that “our nation has always been righteous” made in a poster sponsored by that nation’s government warrants significant doubt not because the claim is automatically false, but because the producer has a strong interest in the claim being believed. This object demonstrates that one legitimate ground for doubt is the source’s motivated interest in being believed — what philosophers call an “interested party”. Propaganda also highlights that motivated claims are not confined to overt political contexts; corporate marketing, scientific research funded by interested parties, and testimony from witnesses with reasons to deceive all share the same structural feature. The poster invites reflection on how doubt grounded in source interest is universal and permanent — not a judgement about any particular claim but about the process that produced it.
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An Optical Illusion Image
A printed optical illusion — the Müller-Lyer lines, the checker-shadow illusion, or a classic rotating dancer — represents a foundational ground for doubting claims: the unreliability of human perception. The illusion demonstrates that our senses, which are the source of most of our first-hand knowledge claims, can be systematically deceived in predictable ways. If a trained observer can look at two lines of identical length and “see” one as longer, the broader implication is clear: every perceptual claim we make carries the possibility that we have been misled by the structure of our own cognition. This object illustrates that doubt is warranted not only for claims from untrustworthy sources but also for claims from ourselves. We are, in philosophical terms, unreliable witnesses to our own experience. The optical illusion reveals that rigorous knowers must treat their own perceptions with the same scrutiny they apply to external sources, recognising that bias, attention failures, and cognitive distortions can produce confident but wrong claims. This invites reflection on the humility required for serious knowledge work.
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2 More Objects for Prompt 4
Two additional examiner-written object examples to help you finalise your TOK exhibition selection.
A Statistical Graph with Misleading Axes
A reproduction of a statistical graph with deliberately misleading axes — a truncated y-axis that exaggerates small differences, an inconsistent scale, a 3D pie chart that distorts relative sizes — illustrates how the same underlying data can support dramatically different claims depending on presentation. A claim like “sales have skyrocketed” may rest on a graph that visually exaggerates a modest change. This object demonstrates that legitimate doubt can be grounded not in the data itself but in the framing used to present it. The graph highlights a subtler phenomenon: two sources can both be technically accurate yet communicate opposing impressions through presentational choices. For the careful knower, this means that doubting a claim often requires going behind the presented version to examine raw numbers, axes, selection criteria, and assumptions. This invites reflection on how contemporary knowledge environments, saturated with data visualisation, require knowers to develop sophisticated scepticism about the medium, not just the message.
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A Deepfake Video Still
A still frame from a deepfake video — synthesised using artificial intelligence to make a real person appear to say or do things they never did — represents a new and rapidly evolving ground for doubt: technological fabrication. Until recently, video footage was considered among the most reliable forms of evidence. A video of a politician making a statement was nearly incontrovertible. Deepfakes have collapsed that reliability. This object illustrates that technological capability can create new grounds for doubt that did not exist a decade ago. Any video claim must now carry an asterisk acknowledging the possibility of synthesis. The deepfake also reveals that grounds for doubt evolve historically: what was trustworthy to previous generations may no longer be trustworthy today, and what is trustworthy today may not be tomorrow. This pushes reflection on the need for knowers to update their scepticism as technology progresses, and to develop new tools (provenance metadata, detection algorithms, contextual verification) to restore confidence in claims that older methods once secured.
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Knowledge Questions for Prompt 4
Use these knowledge questions to strengthen the analytical depth of your exhibition commentary.
Are grounds for doubt universal across areas of knowledge, or does each discipline (science, history, mathematics, the arts) define its own legitimate reasons for scepticism?
What distinguishes productive doubt (that sharpens inquiry) from corrosive doubt (that undermines all functional trust in knowledge)?
When should we doubt the claim itself, and when should we doubt the claimant? Are these two different kinds of scepticism, or the same?
If our own perception can be systematically deceived, how can first-person claims ever be secure grounds for knowledge?
Does the emergence of new technologies — deepfakes, synthetic media, generative AI — require new categories of doubt that didn’t exist before?
Is there a point at which doubting a well-evidenced claim becomes itself irrational, and how do we recognise when scepticism tips into denial?
How to Score High on Prompt 4
Three strategies our IB examiners use when coaching students through the TOK exhibition.
Pick three different grounds for doubt
Weak exhibitions give three examples of the same ground (all source-based, or all methodological). Top-band exhibitions give three distinct grounds — e.g. methodological, motivated-source, and perceptual — showing the range of legitimate scepticism.
Engage the limits of doubt
Examiners reward candidates who recognise that doubt itself has limits — that excessive scepticism becomes corrosive, making all action impossible. A subtle commentary distinguishes productive scepticism from paralysing cynicism.
Justify — don’t just describe
The top markband (9–10) is reached only when the commentary explains why the object illustrates the prompt, not just that it does.
TOK Exhibition Prompt 4 — FAQs
What is TOK Exhibition Prompt 4?
Which optional themes fit Prompt 4?
Is doubt always good for knowledge?
What word limit applies to the TOK exhibition?
Can Sev7n help me with Prompt 4?
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