I agree with f-dot and msc52 about the suggestion of adding an “Updates” step to the steps of project scheduling. This allows for the project manager to be aware of any potential delays to the original timeline, and will allow him or her to be able to communicate to the other members of the project team who may be affected by it. I came across this when one of the tasks that I was assigned was dependent on the completion of another task by another department. The completion of their task was delayed because the resource that was assigned at the beginning of the project left the company and was never replaced. The project manager was not made aware of this until I was ready to begin my task, and had to push the other department to provide the necessary resource that they committed to. By adding an “update” step, these kinds of situations can be avoided.