Who associated with the project team can suggest changes to a project schedule? Discuss why changes would occur in a project. If changes are made to the schedule, explain how the schedule would be updated to show these changes and what other impacts these changes would have on the project's plan. Finally, discuss why a project manager would use a project completion time in terms of the number of days after the project starts instead of providing a specific date. In your discussion, provide examples of instances when this would be appropriate.