According to the PMBOK Guide, 7th edition, one of the principles of project management is to collaborate with stakeholders. This means that the project manager should identify, analyze, and engage the project stakeholders throughout the project life cycle, using various communication methods and tools. The level and frequency of stakeholder engagement may vary depending on the stakeholder's interest, influence, expectations, and needs. A member of the board of directors who is the sponsor of a project that is important to the organization but has many other priorities and is not currently engaged in the project activities should be kept informed and consulted with based on their needs. This will help to ensure that the sponsor is aware of the project status, issues, risks, and changes, and can provide support and guidance when needed. The project manager should also consult with the sponsor to understand their expectations, preferences, and feedback, and to involve them in governance and decision making as appropriate. Keeping the stakeholder informed and consulted with based on their needs will help to maintain a positive and trusting relationship with the sponsor and increase the likelihood of project success. References: PMBOK Guide, 7th edition, page 9, Principle 2:
Collaborate with Stakeholders; page 31, Section 2.3.1, Project Stakeholders; page 41, Section 2.5.1.1, Stakeholder Analysis; page 42, Section 2.5.2.2, Stakeholder Engagement Plan.