A project's business case was just approved and the project manager is creating the benefits management plan, but alignment with the organization's vision is unclear. What should the project manager do first to confirm alignment?

Meeting with the project sponsor is the most appropriate first step because the sponsor is ultimately accountable for the project's success and its alignment with organizational objectives. They initiated the project and approved the business case, making them the primary source for clarifying the organizational vision and how the project contributes to it. Consulting project team members is premature as they may not have the strategic oversight needed. Asking the team to delay kickoff is an overreaction and unproductive. Requesting the project assumptions log might provide some context, but it won't directly clarify the strategic alignment in the same way a discussion with the sponsor can.