CISA Practice Question: Information Systems Acquisition, Development, and Implementation

Which of the following is a key advantage of using an iterative SDLC model over a waterfall model?

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Provides more flexibility to adapt to changing requirements

Iterative models allow for adjustments based on feedback and changing requirements, which is a key advantage.

Answer analysis

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Reduces the need for user involvement
Why it's wrong here
Iterative models require frequent user feedback.
✗
Better suited for projects with stable requirements
Why it's wrong here
Waterfall is better for stable requirements.
✗
Easier to manage project costs
Why it's wrong here
Iterative models typically increase cost volatility due to re-estimation after each cycle, whereas waterfall’s fixed upfront scope allows a single, stable budget baseline. This option is tempting because waterfall’s rigid phases often cause late-stage cost overruns, making iterative budgeting appear more predictable; in a project with highly stable requirements, waterfall would indeed offer tighter cost control.
✓
Provides more flexibility to adapt to changing requirements
Why this is correct
Iterative models embrace change.

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