Managing project managers
While you are creating your project, you can designate users who act as project managers for a given project. If you do not specify a project manager during project creation, you can specify one from the Settings tab of a project.
About this task
At least one designated project manager must be specified before you start your project. If you do not specify any user as project manager, but you assign task to the Project Managers variable, your risk having tasks that cannot be worked on because they do not have any assignees.