Eighty percent of marketers believe they write good briefs. Ten percent of the creative agencies reading those briefs agree. That 70 point gap is the real answer to how you should brief an agency, and it has little to do with templates.
The figures come from the BetterBriefs study, run by the IPA with Mark Ritson across more than 1,700 marketers and agency staff in over 70 countries. Respondents estimated that poor briefing wastes about 33% of marketing budgets. On a hypothetical annual spend of 2 million TL, that is roughly 660,000 TL misdirected before a single ad runs.
How do you write a brief for an advertising agency?
A good agency brief fits one business problem, one measurable objective, a real audience, a real budget and a fixed deadline onto a single page, and is then written back by the agency in its own words. Most guides stop at the checklist. According to BetterBriefs, 78% of marketers say their briefs give clear strategic direction; 5% of agencies agree. A completed template is not the same as a transferred strategy.
What must a brief contain?
At minimum, seven fields: the business problem, one objective with its metric, what the audience does today, a single message, proof for that message, a budget split by media and production with a timeline, and the non-negotiable constraints.
- "Raise awareness" is a wish. "Most first-time buyers never buy again" is a problem.
- An objective without a named metric and reporting source becomes an argument when the campaign ends.
- "Women aged 25 to 40" is a filter, not an audience. Describe what they buy now and why.
- If you have two messages, rank them yourself.
Should you hide the budget from the agency?
No; a hidden budget pushes the agency toward an idea you cannot afford or a cautious one shrunk to protect you, and either way you lose a round. In the BetterBriefs data, 69% of marketers and 73% of agencies say rebriefs happen too often. A range is acceptable. Silence is not.
What does a bad brief actually cost?
It costs you the creative, and Nielsen's analysis of advertising effectiveness attributes 47% of sales impact to creative quality, against 22% for reach and 9% for targeting. Marketers and agencies in the same work guessed 17% each for creative and reach. Binet and Field's IPA analysis adds a second lesson: long-term effect peaks, on average, near a 60/40 split between brand building and activation. Write your intended balance into the brief instead of leaving the agency to guess it.
You do not write a brief so the agency understands it. You write it so the agency can explain it back to you.
How do you test a brief before sending it?
If you cannot explain the problem and the single message to a colleague who has not seen the brief in 30 seconds, it is not ready. Then ask the agency for a one-page brief-back within 48 hours, in their words. BetterBriefs found 83% of marketers think their language is clear while 7% of agencies agree; only a written brief-back closes that gap before the first creative presentation, rather than after it.
Log the reason for every rebrief: missing information, a changed objective, or an idea that did not land. Six months of that log will show where your budget leaks more honestly than any agency report.
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