A quick mock-up (or prototype) is a highly effective way to visually represent the product's features and functionality to stakeholders. This allows stakeholders to get a tangible sense of what the product will look like and how it will work. By iterating on this mock-up and adjusting it based on feedback, the team can build consensus and gain stakeholder approval more effectively. This approach encourages active collaboration and ensures that the product aligns with stakeholder expectations early in the development process.