Which model focuses on developing a component or system through repeated cycles?

The iterative development model emphasizes the process of building a component or system through repeated cycles, focusing on refining and enhancing the software with each iteration. In this model, after an initial version of the product is developed, it is reviewed, and feedback is gathered. This feedback leads to modifications and improvements, creating a more robust product by the end of the cycle.

Each iteration typically involves the same phases of development — planning, design, coding, and testing — but allows for reassessment and realignment of features based on user feedback and changing requirements. This flexibility makes the iterative development model particularly suitable for Agile environments, where responsiveness to change and continual improvement are key.

The other models present various approaches to development but do not emphasize repeated cycles in the same way. The incremental development model focuses on building the system in pieces, but not necessarily iterating on the same pieces before moving on. The Waterfall model follows a sequential and linear process, without opportunities for revisiting and revising previous steps. Lastly, while the Spiral model does incorporate iterative development, it is distinguished by its focus on risk assessment in each cycle, making it less about general iteration and more about managing uncertainty in complex projects.