Interface interference · European Union
Trick question
The label “Trick question” describes this recurring design mechanism: a question or control uses confusing, reversed or leading semantics so the user's likely interpretation may not match the resulting choice. It is a design and research taxonomy, not a standalone legal conclusion. Depending on the complete journey and likely effect, current EU consumer or sector rules may require separate assessment. No published Digital Fairness Act proposal currently creates a pattern-specific prohibition or duty under this label.
- Family
- Interface interference
- Also known as
- Journey stages
Definition
What is this pattern?
A question or control uses confusing, reversed or leading semantics so the user's likely interpretation may not match the resulting choice. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.
How it works
A question or control uses confusing, reversed or leading semantics so the user's likely interpretation may not match the resulting choice. Negation, reversal or answer-label ambiguity breaks the link between the user’s response and the state that response will create.
Warning signs
- A response control has a predictable semantic interpretation.
- Negation, label structure or inconsistent conventions make that interpretation materially ambiguous.
- The ambiguity favours a business outcome or creates plausible detriment.
Potential harms
- A user may subscribe to promotions while believing they refused them.
- The subscriber may preserve the plan accidentally because neither answer has a predictable consequence.
Learn by comparison
What does this look like?
These fictional examples make the design mechanism easier to recognise. They do not depict a real company and do not establish that an individual interface is unlawful.
Illustrative example 1 · Account signup
A fictional signup asks users to tick “Do not untick if you do not want to miss offers”, making the resulting marketing choice hard to predict.
Potential consumer harm: A user may subscribe to promotions while believing they refused them.
Illustrative example 2 · Membership cancellation
A fictional cancellation dialog asks “Are you sure you don’t want us not to keep your plan active?” before displaying yes and no buttons.
Potential consumer harm: The subscriber may preserve the plan accidentally because neither answer has a predictable consequence.
Double negative controls marketing
A fictional signup asks users to tick “Do not untick if you do not want to miss offers”, making the resulting marketing choice hard to predict.
Communication preferences. The checkbox uses two negatives and an unclear default.. Selected: Do not untick to opt out. Continue with selected choices
Email offers. The optional choice states exactly what checking it does.. Not selected: Send me optional email offers. Save these choices. Purpose and refusal effect, expanded: The form explains why “Send me optional email offers” is requested and what happens if it is not used.
Why the first version can mislead: The presentation changes what the user can notice or predict at the signup decision. The problematic state shows: “The checkbox uses two negatives and an unclear default.” Its influence should be tested by comparing the consequence and usability of “Do not untick to opt out” with “Send me optional email offers”. A user may subscribe to promotions while believing they refused them.
What a fairer design does: Use one positive proposition, an unticked control and a direct explanation of the resulting state.
Show annotated differences (2)
- Continue with selected choicesIn “Double negative controls marketing”, this element shows how trick question can shape the decision.
- Purpose and refusal effect, expanded: The form explains why “Send me optional email offers” is requested and what happens if it is not used.In “Double negative controls marketing”, this element keeps the clearer alternative visible at the same decision point.
Review questions (3)
- Do “Do not untick to opt out” and “Send me optional email offers” receive comparable prominence and explain their consequences before activation?
- Which fields or permissions are required, what happens on refusal, and does the resulting state support this criterion: “A response control has a predictable semantic interpretation”?
- What neutral rendering or comprehension result would falsify the classification, particularly in light of “Unavoidable technical distinction clearly explained”?
Reversed wording in cancellation survey
A fictional cancellation dialog asks “Are you sure you don’t want us not to keep your plan active?” before displaying yes and no buttons.
One last question. A double negative separates the button labels from their actual outcomes.. Yes / No. End plan on 30 September
Choose the account outcome. Each action names the result and effective date.. End plan on 30 September. Yes / No. What happens next, expanded: Activating “End plan on 30 September” produces the outcome stated on the control.
Why the first version can mislead: The presentation changes what the user can notice or predict at the cancellation decision. The problematic state shows: “A double negative separates the button labels from their actual outcomes.” Its influence should be tested by comparing the consequence and usability of “Yes / No” with “End plan on 30 September”. The subscriber may preserve the plan accidentally because neither answer has a predictable consequence.
What a fairer design does: Replace yes/no answers with explicit actions that state whether the plan ends or continues.
Show annotated differences (2)
- End plan on 30 SeptemberIn “Reversed wording in cancellation survey”, this element shows how trick question can shape the decision.
- What happens next, expanded: Activating “End plan on 30 September” produces the outcome stated on the control.In “Reversed wording in cancellation survey”, this element keeps the clearer alternative visible at the same decision point.
Review questions (3)
- Do “Yes / No” and “End plan on 30 September” receive comparable prominence and explain their consequences before activation?
- Can the dialog be dismissed, what action does each control trigger, and what later state confirms or contradicts “Negation, label structure or inconsistent conventions make that interpretation materially ambiguous”?
- What neutral rendering or comprehension result would falsify the classification, particularly in light of “minor stylistic awkwardness with unambiguous outcome”?
What is a fairer alternative?
Use explicit action labels that name the resulting state, remove double negatives and verify that each response produces the consequence a user can reasonably predict.
Legal and information status
Legal position at a glance
A question or control uses confusing, reversed or leading semantics so the user's likely interpretation may not match the resulting choice. Negation, reversal or answer-label ambiguity breaks the link between the user’s response and the state that response will create. Risk increases where the mechanism changes a material consumer choice, hides a consequence or makes a genuine alternative harder to use. The taxonomy label remains a review prompt and does not establish an infringement.
Dark-pattern research taxonomy
Editorial analysis
The cited research sources support identification and comparison of this recurring interface mechanism. They do not determine that a particular interface is unlawful.
UCPD Articles 5 to 9, where applicable
Possible risk indicator
Depending on the trader, audience, overall presentation, material information and likely transactional effect, the facts may require a separate assessment under the applicable UCPD provisions.
Evidence layers and open questions
Applicable law, enforcement records, policy preparation, stakeholder input, editorial analysis and unknown future details remain visibly distinct.
Current lawCurrent law
The UX label “Trick question” is not a standalone EU offence. Depending on the trader, audience, complete presentation, omitted information and likely transactional effect, the observed facts may require a separate assessment under the applicable UCPD provisions or another instrument within scope.
Under considerationUnder consideration
The Commission is preparing a Digital Fairness Act initiative, but the call for evidence does not select a final rule for trick question or establish that this taxonomy term will appear in a proposal.
Editorial analysisEditorial analysis
The pattern definition, variants and examples on this page use the cited research taxonomy sources to support recognition and comparison. That analytical classification is not a legal conclusion about an individual interface.
UnknownUnknown
No published DFA proposal currently establishes a definition, covered actor, legal threshold, duty, remedy, transition rule or application date for trick question. Those details remain unknown pending primary legislative text.
Context matters
Context and boundary cases
- A response control has a predictable semantic interpretation.
- Negation, label structure or inconsistent conventions make that interpretation materially ambiguous.
- The ambiguity favours a business outcome or creates plausible detriment.
- Exclude or qualify the label where unavoidable technical distinction clearly explained.
- Exclude or qualify the label where minor stylistic awkwardness with unambiguous outcome.
When a similar design can serve a legitimate purpose
- A similar design should not be classified this way where unavoidable technical distinction clearly explained.
- A similar design should not be classified this way where minor stylistic awkwardness with unambiguous outcome.
Operational review
What teams should review
- Teams
- Do “Do not untick to opt out” and “Send me optional email offers” receive comparable prominence and explain their consequences before activation?
- Which fields or permissions are required, what happens on refusal, and does the resulting state support this criterion: “A response control has a predictable semantic interpretation”?
- What neutral rendering or comprehension result would falsify the classification, particularly in light of “Unavoidable technical distinction clearly explained”?
- Do “Yes / No” and “End plan on 30 September” receive comparable prominence and explain their consequences before activation?
- Can the dialog be dismissed, what action does each control trigger, and what later state confirms or contradicts “Negation, label structure or inconsistent conventions make that interpretation materially ambiguous”?
- What neutral rendering or comprehension result would falsify the classification, particularly in light of “minor stylistic awkwardness with unambiguous outcome”?
- Which complete journey evidence supports or contradicts the trick question classification?
Evidence to retain
- Versioned captures of the Signup and Cancellation states before, during and after the relevant decision
- Configuration, content and event records supporting the observed trick question mechanism
- Responsive, keyboard and assistive-technology review of every material option and consequence
- Control defaults, validation rules and consent or selection state changes
Legal map and implementation tools
Evidence base
Sources
- Dark commercial patternsOrganisation for Economic Co-operation and Development · Secondary · checked 2026-09-14 · OECD Digital Economy Papers No. 336
- Unfair Commercial Practices DirectiveEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Directive 2005/29/EC; CELEX 02005L0029-20220528
- Digital Fairness Act: call for evidence for an impact assessmentEuropean Commission · Primary · checked 2026-08-09 · Initiative 14622; Ares(2025)6275573
- Commission work programme 2026: Europe's Independence MomentEuropean Commission · Primary · checked 2026-09-14 · COM(2025) 870 final; CELEX 52025DC0870; Annex I item 30