An agile approach is suitable for projects with unstable or changing requirements, as it allows for frequent feedback and adaptation. By refining and prioritizing the requirements according to the project objectives, the project manager can ensure that the most valuable features are delivered to the customer in an iterative and incremental manner. This can also increase the stakeholder satisfaction and engagement with the project. References: * PMBOK Guide, 6th edition, section 4.2.2.3, page 141 * PMI Agile Practice Guide, section 2.1, page 9 * Free PMP Practice Exam Questions - 120 Sample Test Questions, question 18