In a project, especially when a new approach is being used, it is crucial to ensure that all key stakeholders, including the project sponsor, are aware of and understand the approach. This is because these stakeholders often have a significant influence on the project's success. By explaining and communicating the new approach, the project manager can ensure that everyone is on the same page, which can help to prevent misunderstandings and conflicts later on. This is also in line with the PMBOK Guide's emphasis on the importance of effective communication in project management. References: Project Management Body of Knowledge (PMBOK) Guide, 6th Edition, Section 10: Project Communications Management