The project manager is developing a project schedule. The project manager negotiated with all the execution organizations， and the task times are as short as possible. After manipulating the schedule， the project completion date is still beyond the date requested by the business owners of the project. The project manager believes that the content agreed on for the project is appropriate， and concludes that this schedule should be taken to the business owners and renegotiated. Which one of the following tools will help the project manager justify the revised schedule？（）