What function does the Mockup UI tab serve in a story card?

The Mockup UI tab plays a crucial role in visualizing the proposed user interface for a story card within a project. This feature enables stakeholders, including designers, developers, and product owners, to see a representation of what the application will look like and how users will interact with it. By providing a visual mockup, it helps facilitate discussions around usability, design considerations, and overall user experience.

The other options do not align with the primary purpose of the Mockup UI tab. Outlining project deadlines pertains to project management rather than UI design; listing team member responsibilities focuses on roles and tasks, which are separate from the interface itself; and documenting budget estimates relates to financial aspects rather than visual design. Hence, the emphasis on visual representation in the Mockup UI tab makes it instrumental in the design process.