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JAD is a methodology that focuses on collaborative workshops to gather requirements and design systems with stakeholders. While it facilitates user involvement, it does not specifically emphasize rapid prototyping or iterative development, making it less suited for fast-paced development compared to RAD.

Loose coupling is a design principle that promotes separating components in a system to reduce dependencies between them. While this principle can contribute to flexibility and maintainability in software architecture, it does not inherently relate to the speed of development or iterative prototyping that RAD embodies.

Discovery prototyping is a technique used to explore and clarify requirements through building prototypes early in the development process. However, it is often more exploratory and not specifically structured for rapid iteration and development like RAD, which focuses on delivering functional components swiftly.