A health insurance provider undertakes enhancements to its mobile application platform and finalizes the following capabilities as part of the scope of the next release:

A process model represents the flow of activities and decisions in a business process and does not demonstrate user interface or interaction design for a mobile application.

A concept model illustrates relationships between key domain concepts and entities, not the visual design or user experience of a mobile application feature.

A usability prototype focuses specifically on user interface layout, navigation, and interaction design without requiring full back-end functionality to be implemented. For a mobile application enhancement involving GPS and map integration, it allows stakeholders to interact with the proposed UI and provide feedback on ease of use before significant development investment is committed. This makes it the most efficient tool for validating the experience-focused aspects of the planned mobile platform release.

A functional prototype implements actual working code and system behavior, making it more resource-intensive than necessary for initial UI and UX validation of a planned feature.