In which type of model are the results of each phase referred to as deliverables that flow into the next phase?

In the Waterfall model, the development process is structured in distinct, sequential phases where each phase produces specific outputs, known as deliverables. This approach emphasizes a linear progression through stages such as requirements, design, implementation, verification, and maintenance. Each deliverable from one phase serves as an input to the subsequent phase, which highlights the importance of documentation and formal reviews before progressing to the next stage.

This model tends to work best for projects with well-understood requirements and where changes are minimal during the development cycle. The clear structure and focus on deliverables help maintain a coherent flow throughout the project, ensuring that each step builds upon the previous one effectively.

In contrast, the other models typically incorporate more flexibility or iterative processes. For instance, Agile focuses on adaptability, where requirements and solutions evolve through collaborative effort, and Spiral emphasizes risk management and iterative development. Iterative models allow for revisiting previous phases as more information or feedback becomes available, while the Spiral model combines iterative development with systematic risk assessment at each cycle. These approaches do not strictly define deliverables flowing in a linear manner from one phase to the next as the Waterfall model does.