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The preferred solution development approach when there is significant requirements uncertainty is one that is flexible and adaptive, which is characteristic of a change-driven approach. This methodology allows for iterative cycles of development where requirements can evolve based on feedback and ongoing discovery as the project progresses.

In situations where requirements are unclear or likely to change, a change-driven approach supports regular reassessment of project goals and deliverables. This enables business analysts and stakeholders to better understand user needs and make informed adjustments to the project scope and features as more information becomes available.

On the other hand, methods like the waterfall and plan-driven approaches are typically more rigid, relying on detailed upfront planning and a fixed sequence of development stages. These approaches may struggle to accommodate changes once the project is in motion, making them less suitable in environments with high uncertainty. The phased approach, while less rigid than waterfall, still implies a level of structure that could limit adaptability in the face of changing requirements.

Thus, for projects with significant requirements uncertainty, a change-driven approach is ideal as it encourages flexibility, collaboration, and responsiveness to evolving user needs.