Final answer:
During Product Backlog Refinement (PBR) sessions, the ScrumMaster facilitates the meeting, time-boxes discussions, and helps clarify backlog items to ensure they are well understood for the upcoming Sprint planning.
Step-by-step explanation:
The ScrumMaster plays a crucial facilitative role during the Product Backlog Refinement (PBR) process in a Scrum project. The PBR, which is also known as backlog grooming, is when the Scrum team reviews the Product Backlog to ensure the requirements are clear and ready for sprint planning. The ScrumMaster's primary responsibilities during PBR include ensuring that the refinement session runs smoothly, time-boxing discussions to maintain focus, and assisting in clarifying any misunderstandings regarding the backlog items. They may also mediate any discussions between the Product Owner and the development team to foster a mutual understanding of what is needed for the upcoming Sprint. The ScrumMaster ensures that the environment is conducive to collaborative work, helping the team in achieving a finer-grained and better-understood backlog.