Interface interference · Australia
Trick question
Trick question is a working label for this design mechanism: A question or control uses confusing, reversed or leading semantics so the user's likely interpretation may not match the resulting choice. This is editorial implementation guidance for Australian journeys, not a finding of unlawfulness. From 1 July 2027, a similar interface is relevant to ACL section 28B only if the complete consumer-connection, manipulation or unreasonable-distortion and actual-or-likely-detriment test is met. Current ACL rules require a separate assessment.
- 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. This is a design and research taxonomy for learning and evidence review, not a statutory offence label or an automatic finding that an interface is unlawful.
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 · 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.
Potential consumer harm: A user may subscribe to promotions while believing they refused them.
Illustrative example 2 · 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.
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 (4)
- The checkbox uses two negatives and an unclear default.Why this state matters: 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.
- Continue with selected choicesReview prompt: Do “Do not untick to opt out” and “Send me optional email offers” receive comparable prominence and explain their consequences before activation?
- The optional choice states exactly what checking it does.Fairer design: Use one positive proposition, an unticked control and a direct explanation of the resulting state.
- Purpose and refusal effect, expanded: The form explains why “Send me optional email offers” is requested and what happens if it is not used.Review prompt: 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”?
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 (4)
- A double negative separates the button labels from their actual outcomes.Why this state matters: 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.
- End plan on 30 SeptemberReview prompt: Do “Yes / No” and “End plan on 30 September” receive comparable prominence and explain their consequences before activation?
- Each action names the result and effective date.Fairer design: Replace yes/no answers with explicit actions that state whether the plan ends or continues.
- What happens next, expanded: Activating “End plan on 30 September” produces the outcome stated on the control.Review prompt: 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”?
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
How Australian law may apply
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. These harms describe a review risk, not an automatic legal conclusion. Australian section 28B commences on 1 July 2027 and requires its complete, context-specific test. Existing ACL provisions remain a separate current-law assessment.
ACL section 28B, inserted by the 2026 Act
Possible risk indicator
In signup and cancellation journeys, the trick question mechanism may warrant review where it manipulates a consumer or unreasonably distorts the decision environment and causes, or is likely to cause, detriment. The interface interference label and an interface similarity do not establish a contravention; the complete section 28B test, scope, facts and evidence must be applied from 1 July 2027.
Dark-pattern research taxonomy
Editorial analysis
The cited research sources support this working pattern within the interface interference family. It is editorial implementation guidance, not an Australian statutory category, regulator finding or legal safe harbour.
Evidence layers and open questions
Applicable law, enforcement records, policy preparation, stakeholder input, editorial analysis and unknown future details remain visibly distinct.
Final Act mappingEditorial implementation guidance
This editorial practice label is not itself an express statutory prohibition. Apply the complete provision and its scope to the facts.
Possible general-test applicationCommences 1 July 2027
ACL section 28B, inserted by the 2026 Act: In signup and cancellation journeys, the trick question mechanism may warrant review where it manipulates a consumer or unreasonably distorts the decision environment and causes, or is likely to cause, detriment. The interface interference label and an interface similarity do not establish a contravention; the complete section 28B test, scope, facts and evidence must be applied from 1 July 2027.
Existing ACLCurrent enforcement
Existing ACL provisions continue to apply on their own elements before and after commencement. The 2027 provisions must not be applied early.
Verified enforcement contextCurrent enforcement
No named pattern-specific enforcement example is asserted on this page. Existing ACL analysis remains fact-specific and separate from the 2027 provisions.
RegulationsRegulation pending
Later regulations may affect specified exclusions, matters or exceptions. That uncertainty does not postpone a core enacted rule unless the provision itself depends on prescription.
Regulator implementation materialGuidance pending
Government funding and parliamentary material anticipate regulator education and guidance. No dedicated final ACCC implementation guide is treated here as published.
Journey and evidence recommendationsEditorial implementation guidance
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. This is editorial portal guidance, not a statutory duty, regulator safe harbour or compliance certificate.
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.
- Boundary to test: Unavoidable technical distinction clearly explained
- Boundary to test: minor stylistic awkwardness with unambiguous outcome
When a similar design can serve a legitimate purpose
- Unavoidable technical distinction clearly explained
- 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”?
Evidence to retain
- Annotated signup and cancellation screenshots at each responsive breakpoint
- The complete state sequence before, during and after the consumer decision
- Design-system component, content, default and configuration records for the reviewed release
- Operational records substantiating price, availability, timing and eligibility claims
- Usability, accessibility, reversal, complaint and support evidence relevant to consumer impact
- A dated product and legal review record identifying evidence, uncertainties and release decisions
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
- Competition and Consumer Amendment (Unfair Trading Practices) Act 2026Federal Register of Legislation · Primary · checked 2026-09-14 · C2026A00064
- Competition and Consumer Act 2010, including Schedule 2: Australian Consumer LawFederal Register of Legislation · Primary · checked 2026-09-14 · C2004A00109
- Unfair trading tricks and traps to be bannedTreasury Ministers · Primary · checked 2026-09-14
- Inquiry into the Competition and Consumer Amendment (Unfair Trading Practices) Bill 2026Senate Economics Legislation Committee · Primary · checked 2026-08-09