Which method involves a series of phases where each phase starts only when all tasks from the previous phase are completed, creating a cascading effect?

The Waterfall model is characterized by its linear and sequential approach to software development. In this methodology, the project is divided into distinct phases, and each phase must be completed before the next phase begins. This creates a cascading effect, where the output of one phase becomes the input for the subsequent phase.

By following this structured process, teams can focus on specific tasks within each phase, which allows for careful planning and a clear timeline. This approach is particularly beneficial in projects where requirements are well understood from the outset and changes are limited, as it emphasizes thorough documentation and sequential progress. The systematic nature of Waterfall allows for easier management of tasks, but it can also lead to challenges if changes need to be made after a phase is completed.

In contrast, other methodologies like Agile and Spiral involve more flexibility and iterative development. Agile promotes continuous iterations and allows for changes at various stages, while the Spiral model incorporates risks and iterative refinement. SecDevOps integrates security practices into DevOps workflows, emphasizing collaboration and automation throughout the development lifecycle rather than following a strict sequence of phases. Each of these alternatives diverges from the Waterfall model's strict phase completion requirement.