FIELD GUIDE 10 / Psychology & creative
Advertising claims: write promises people can verify
A strong claim is specific enough to understand and supported well enough to trust. Copy becomes clearer when the writer separates the audience benefit, the factual promise, the evidence and any condition that materially changes the meaning.
QUICK ANSWER
The idea in one minute.
A practical method for benefits, evidence, qualifications and readable disclosures. Evidence should exist before publication The overall impression matters A disclosure cannot repair a contradictory headline
KEY IDEAS
What you will learn
- Evidence should exist before publication
- The overall impression matters
- A disclosure cannot repair a contradictory headline
01
Translate a benefit into a claim
‘Feel organised’ is a benefit direction; ‘sort receipts into dated folders in one tap’ is a feature claim that can be demonstrated. Both may be useful, but they need different evidence. Separate emotional value from factual performance so neither quietly borrows certainty from the other.
Write the narrowest meaningful promise. Define who, what, compared with what, under which conditions and over what period. Specificity gives researchers something to verify and gives customers a fair basis for comparison.
02
Support the message before it runs
Evidence should fit the claim. A laboratory test may support performance under controlled conditions but not universal real-world results. Customer testimonials describe individual experience and do not by themselves prove that most customers will achieve the same outcome.
Keep an evidence file with the final creative, underlying research, dates, product version and review decision. If the product or market changes, reassess the claim. Substantiation is a continuing discipline, not a document collected after a complaint.
03
Judge the overall impression
People interpret headline, imagery, layout, audio and omissions together. A technically true sentence can still create a misleading overall impression. Review the likely takeaway without explaining what the team intended.
Qualifications should be close, readable and understandable on the device where the message appears. A footnote cannot contradict the main promise. If a condition is essential to the decision, place it in the main claim or revise the claim until the condition is no longer hidden.
04
Create a plain-language review
Ask a colleague unfamiliar with the project to explain the offer, total price, evidence and main limitation after one reading. Misunderstandings reveal where internal knowledge has leaked into the copy. Repeat on a small screen and with zoomed text.
Keep urgency proportional to reality. A deadline, limited quantity or eligibility rule can be useful information when accurate. Fabricated scarcity and ambiguous countdowns replace evaluation with pressure and damage the credibility of every other statement.
SOURCE DESK
Research and further reading
These links lead to public guidance, open textbooks or freely accessible research. This guide explains the ideas in original language; open the sources to examine context, definitions and limitations.
- Advertising FAQ: A Guide for Small Business ↗US Federal Trade Commission guidance on truthfulness, evidence, disclosures and endorsements.
- .com Disclosures ↗FTC guidance on clear and conspicuous online disclosures across devices.
- Misleading advertising ↗European Commission overview of protections against misleading and comparative advertising.
- Plain Language ↗US government guidance for organising and writing information people can use.