Final answer:
The waterfall model limits iterations because of its linear and sequential nature, making it difficult to incorporate changes later in the process. It assumes stable requirements and lacks flexibility as technology and needs evolve.
Step-by-step explanation:
The waterfall model is a linear and sequential method of software development. It consists of distinct phases such as requirements gathering, design, implementation, testing, and maintenance. Iterations are typically limited in the waterfall model because each phase must be completed before moving on to the next, and changes can only be made in subsequent phases.
This limitation can be problematic because it is difficult to foresee all the requirements and constraints at the beginning of a project. As the development progresses, stakeholders may realize the need for changes or improvements, but the inflexible nature of the waterfall model makes it challenging to incorporate these changes without completely revisiting earlier phases.
Additionally, the waterfall model assumes that software and hardware requirements are stable throughout the development lifecycle. This assumption can be unrealistic in practice, as technology and requirements may evolve over time. As a result, the limited iterations in the waterfall model can lead to outdated or suboptimal solutions.