Quick answer: A good brief tells us what the sign needs to make people do, not just what sign you want. It covers your audience, offer, location, action, and who makes the final call.
Describe the customer's moment
Tell us where the person is coming from, what they're doing, and how fast they need to understand your message.
Pick one action
Pick the one thing you want people to do: visit, turn, call, or book. Make sure your business can actually handle that.
Separate facts from preferences
A color or phrase you like isn't always the best choice or even available. Tell us what's a must and what's just a preference.
Say who makes the final call
Tell us who approves the offer, the artwork, the schedule, and the payment. This avoids last-minute surprises.