So, what is a design brief?
A design brief is a document outlining the business objectives and design strategies for a project. It gets the design wheels rolling and helps us to think strategically about design solutions. It also encourages the client (you) to process and clarify what you need from a project, who the target audience is, and who the key stake-holders are.
How does a design brief relate to a marketing plan?
You could think of a marketing plan as the set of rules that direct your marketing activities. The marketing plan is simply a way to focus on one or more marketing objectives.
A successful design brief will inevitably be informed by your marketing plan. For example, if one of the objectives in your marketing plan is to target a specific age-group, this should be stated in your design brief. We can then use this information to propose design ideas that are coherent with your marketing plan.