Which development methodology emphasizes rapid and extensive user involvement?

The correct choice emphasizes a development methodology that is characterized by quick iterations and a strong focus on user feedback. Rapid Application Development (RAD) methodology is specifically designed to promote extensive user involvement throughout the development process. It allows users to actively participate in designing prototypes and providing feedback, ensuring that the final product aligns closely with their needs and expectations.

This approach often involves iterative development, meaning that users can see and interact with prototypes, suggest changes, and influence the direction of the project in real-time. By incorporating user feedback frequently and prioritizing their insights, RAD fosters a collaborative environment that can lead to more effective and user-friendly results.

In contrast, methodologies like the Waterfall model are more linear and sequential, making it challenging to adapt to user feedback once a phase is completed. Systems Development Life Cycle (SDLC) and Agile methodology do incorporate user involvement, but RAD specifically highlights rapid development cycles and user interactions at every stage of the development process, reinforcing its primary focus on user engagement.