Which methodology emphasizes rapid prototyping over extensive planning?

The methodology that emphasizes rapid prototyping over extensive planning is Rapid Application Development (RAD). RAD focuses on quickly developing software through iterative prototyping, allowing for user feedback and adaptability throughout the process. This approach enables developers to create functional components rapidly, which can then be refined based on user input, making it ideal for projects where requirements might change or are not fully defined at the outset.

In contrast, methodologies like Waterfall development follow a sequential, linear process that relies heavily on thorough upfront planning and documentation. Agile development also values flexibility and iterative progress, but its framework is more structured with defined phases. Spiral development combines elements of design and prototyping in stages, with a focus on risk assessment, but it does not prioritize rapid prototyping to the same extent as RAD. Thus, RAD stands out for its core principle of swift iterations and feedback integration, which makes it the best answer in this context.