Which lifecycle model is described as an incremental approach with sequential steps?

• A. Spiral
• B. Waterfall
• C. Agile
• D. DevOPs

Answer: (B)

This question tests understanding of how different software lifecycle models structure work. When a process is described as an incremental approach performed in clear, sequential steps, the traditional Waterfall model fits best. In Waterfall, work flows through distinct phases in a fixed order—requirements, design, implementation, testing, deployment, and maintenance. Each phase is completed before the next one begins, with formal sign-offs and documentation driving the handoffs. This makes the process predictable and easy to manage, especially when requirements are well understood and unlikely to change.

Other options describe different patterns: Spiral combines iterative cycles with a focus on risk assessment; Agile emphasizes frequent revisions and delivering small increments in short iterations; DevOps is more about culture and practices that bridge development and operations rather than a strict lifecycle model. So the linear, step-by-step progression aligns with Waterfall.