According to the PMBOK Guide, the stakeholder engagement plan is a component of the project management plan that identifies the strategies and actions required to promote productive involvement of stakeholders in project decisions and execution. It also includes the stakeholder register, which is a project document that identifies the stakeholders and their relevant information, such as their interest, influence, expectations, and engagement level. When a new stakeholder is identified, the project manager should update the stakeholder engagement plan and the stakeholder register to reflect the new stakeholder's information and engagement needs. This will help the project manager to communicate effectively with the new stakeholder and ensure their alignment and support for the project. References: PMBOK Guide, Seventh Edition, Section 13.2.3.1; PMP Sample Test Questions, Question 17