Which of the following process models needs to complete each set of tasks in one phase before moving into the next phase in a project development life cycle?

Procedural model is not a recognized standard SDLC process model; it is a programming paradigm concept and does not describe a phased project development lifecycle.

The evolutionary model is iterative and incremental, delivering the system in builds or versions, which means tasks from multiple phases overlap rather than being completed sequentially.

The spiral model combines iterative development with risk analysis, cycling through planning, risk analysis, engineering, and evaluation repeatedly, so phases are not strictly completed one at a time before moving forward.

In the waterfall model, phases such as requirements, design, implementation, testing, and deployment flow in one direction like a waterfall, with no overlap or iteration allowed between phases. Each phase produces a deliverable that gates entry into the next phase, enforcing strict sequential completion. This rigid structure directly matches the question's description of completing each set of tasks in one phase before moving to the next.