The waterfall SDLC model is:

The waterfall SDLC model is:

• A. Sequential
• B. Iterative
• C. Input driven
• D. Output driven

Answer: (A)

Waterfall is a sequential, linear process where each phase follows the previous one with little to no overlap. Requirements are gathered upfront, then design, implementation, testing, deployment, and maintenance proceed in order. Because later work can’t easily feed back into earlier stages, changes are costly and typically require restarting earlier activities. This rigidity is what sets waterfall apart from iterative models that cycle through phases based on feedback. It isn’t driven by inputs or outputs in a cyclic way, but by a straight, step-by-step progression from start to finish.

Waterfall is a sequential, linear process where each phase follows the previous one with little to no overlap. Requirements are gathered upfront, then design, implementation, testing, deployment, and maintenance proceed in order. Because later work can’t easily feed back into earlier stages, changes are costly and typically require restarting earlier activities. This rigidity is what sets waterfall apart from iterative models that cycle through phases based on feedback. It isn’t driven by inputs or outputs in a cyclic way, but by a straight, step-by-step progression from start to finish.