The manual task is the default task type for C1GanttView. It provides greater flexibility for users planning and managing their schedule since it can be positioned anywhere in your schedule and the project won’t move it. Manual tasks do not change the scheduling of the tasks for constraints, project resources, and dependencies. They are useful when project managers don’t have complete information about each task. For example, they may know when the start date of the project is, but not its duration until they receive an estimation from their team members.