A project manager for a large construction project finds the client's blueprints appear incomplete. What should they do first?

The project manager should first consult the client to understand the incompleteness of the blueprints and determine the appropriate path forward. This direct communication ensures the client's expectations are met and avoids potential rework or disputes later. Proceeding with execution using incomplete blueprints risks building something incorrectly, leading to costly changes. Escalating to the project sponsor prematurely bypasses the direct stakeholder who can provide the necessary information. Rescheduling the execution date without understanding the blueprint issue is a reactive measure that doesn't address the core problem.