Day 10: Campaign Brief Writing
The Concept
A bad campaign brief is the most expensive document in marketing. Every ambiguity you leave in it gets amplified by creative teams, media buyers, and agencies who each interpret the gaps differently. The result is misaligned work, expensive revisions, and campaigns that feel slightly off without anyone being able to say why. Brief quality is a leverage point almost no marketing team takes seriously enough.
Why brief review is a perfect AI task
AI is particularly well-suited to critiquing briefs because it has no ego invested in the document and no political reason to say it looks fine when it does not. A human colleague reviewing your brief will often soften their feedback to protect the relationship. AI will tell you that your campaign objective is not measurable, that your key message is actually three messages, and that your audience description contradicts your channel strategy — and it will do so in under 30 seconds. That is not brutal; it is useful.
The SMART objective problem
Most marketing briefs contain objectives that sound strategic but are actually aspirational. "Increase brand awareness among 25-to-34-year-old professionals" is not an objective — it is a direction. A SMART objective tells you whether you succeeded. "Increase unaided brand awareness among 25-to-34-year-old UK professionals from 12% to 18% by 31 December, as measured by quarterly brand tracking" is an objective. The AI's rewrite of your objective will often feel uncomfortably specific — that discomfort is the point.
The one-sentence key message test
If you cannot express your campaign's key message in one sentence of 20 words or fewer, you do not have a key message — you have a list of things you want to say. The one-sentence discipline forces a hierarchy: what is the single most important thing? Everything else is supporting evidence. Run your draft brief through today's prompt and pay particular attention to the rewritten key message. If it surprises you, that is a signal that the brief needed this exercise.
Using the output
Print or paste the AI's critique directly into your brief document alongside your original text. The five creative director questions are especially valuable to share with your team before any briefing meeting — they surface the gaps that would have come up expensively during the creative review. Fix the objective, fix the key message, and address at least two of the three strategic weaknesses before the brief leaves your desk.
Prompt of the day
Copy this into your AI tool and replace any bracketed placeholders.
Prompt
You are a senior marketing strategist with experience across B2B and B2C campaigns. I am writing a campaign brief and I need you to pressure-test it before we brief any agency or creative team. Here is my current draft brief: [PASTE YOUR DRAFT BRIEF IN FULL — include campaign objective, target audience, key message, channels, budget range, and timeline]. Review the brief and do the following: 1. Identify the 3 biggest strategic weaknesses or ambiguities — where is the thinking unclear, contradictory, or likely to cause problems during execution? 2. List 5 questions a good creative director would ask on first reading. 3. Rewrite the campaign objective so it is SMART: specific, measurable, achievable, relevant, and time-bound. 4. Rewrite the key message in one sentence under 20 words — the single thing the audience should think, feel, or do after seeing this campaign. 5. Flag any channel recommendations that appear inconsistent with the stated audience or budget. 6. Suggest one campaign mechanic or hook we may not have considered. The campaign is for [COMPANY NAME], a [TYPE OF BUSINESS]. The target audience is [TARGET AUDIENCE DESCRIPTION]. The primary objective is [CAMPAIGN OBJECTIVE]. The budget is approximately [BUDGET RANGE]. The campaign runs from [START DATE] to [END DATE].
Your 15-minute task
Take a campaign brief you are currently working on — or one from the last quarter. Paste it into the prompt and let the AI critique it. Focus specifically on the rewritten campaign objective and key message. If you do not have an active brief, write a rough paragraph describing a campaign you are planning and use that as the input.
Expected win
A strengthened campaign brief with a sharpened SMART objective, a one-sentence key message, and a prioritised list of strategic gaps to resolve before briefing any creative team.
Power user tip
After the critique, send: 'Now write the audience insight section of the brief. Based on the target audience I described, write 3 insight statements in this format: [Audience] believes [BELIEF]. But the truth is [REFRAME]. Which means [OPPORTUNITY FOR THE BRAND].'