How does rational unified process relate to spiral model?

The Rational Unified Process (RUP) is an iterative software development framework that incorporates elements of the Spiral Model, such as risk management and incremental development. Both approaches emphasize iterative cycles and refining the product through continuous feedback and assessment. RUP breaks the development process into phases and iterations, similar to the Spiral Model's focus on repeated cycles of planning, risk analysis, engineering, and evaluation. Ultimately, RUP can be seen as a structured implementation of the principles found in the Spiral Model, providing a more defined process with specific roles and artifacts.