Which design objects are useful to model in advance of development work?

• A. All of the above
• B. user interfaces
• C. data structures
• D. process models

Answer: (B)

Focusing on user interfaces up front lets you validate how users will interact with the app, which screens they need, and the actions available on each screen. Modeling the UI early clarifies the user journeys, information architecture, and on-screen data entry patterns, which in turn reveals what data must be captured and how it will flow through the system. This concrete prototype provides a solid reference you can share with stakeholders to gather feedback and lock in requirements before diving into deeper technical design.

Those UI sketches or prototypes then guide the later work on data structures and process models. Once you know the exact interactions and screens, you can design data objects and workflows that directly support those tasks, reducing the chance of rework caused by changing requirements. Data structures and process models are still important, but starting with the UI establishes a stable, testable foundation and a clearer scope for the rest of the design work.