According to the PMBOK Guide Seventh Edition, one of the agile practices that can be used in a predictive environment is incremental delivery. This means that the project delivers value to the customer or end user in small increments throughout the project life cycle, rather than waiting until the end of the project to deliver the final product. Incremental delivery allows the project to respond to changing requirements, reduce risks, and increase customer satisfaction. To support incremental delivery, the project manager should also perform frequent backlog refinement, which is the process of reviewing, prioritizing, and updating the list of features or requirements that the project team will work on. Backlog refinement helps the project manager and the team to align their work with the customer's needs and expectations, and to adjust the scope and schedule accordingly. References:
PMBOK Guide Seventh Edition, page 29
Agile Practice Guide, page 13