Which SDLC model uses linear development concepts in an iterative, four-phase process?

Which SDLC model uses linear development concepts in an iterative, four-phase process?

• A. Spiral
• B. Waterfall
• C. Agile
• D. V-Model

Answer: (A)

The concept being tested is how an SDLC model combines iteration with a structured, phase-like workflow. The Spiral model fits this description because it organizes development into repeating loops that are broken into four activities driven by objectives and risk. In each loop, you determine objectives and constraints, identify and address risks, develop and verify part of the system, and then plan the next iteration. This makes the process iterative—you revisit and expand the project over multiple cycles—while still following a defined four-phase structure within each pass. Waterfall and V-Model follow a linear sequence of phases with little or no repetition, so they don’t match the idea of iterative four-phase cycles. Agile is also iterative but is typically described in terms of flexible, smaller increments and sprints rather than a fixed four-phase loop. That combination of iterative loops and a clear four-quadrant workflow is why the Spiral model is the best fit.

The concept being tested is how an SDLC model combines iteration with a structured, phase-like workflow. The Spiral model fits this description because it organizes development into repeating loops that are broken into four activities driven by objectives and risk. In each loop, you determine objectives and constraints, identify and address risks, develop and verify part of the system, and then plan the next iteration. This makes the process iterative—you revisit and expand the project over multiple cycles—while still following a defined four-phase structure within each pass.

Waterfall and V-Model follow a linear sequence of phases with little or no repetition, so they don’t match the idea of iterative four-phase cycles. Agile is also iterative but is typically described in terms of flexible, smaller increments and sprints rather than a fixed four-phase loop. That combination of iterative loops and a clear four-quadrant workflow is why the Spiral model is the best fit.