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Time constraints in parent-child relationships

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Time constraints in parent-child relationships

Parent-child task relationships have several affects on task time constraints.

  • If a child task is set to Start ASAP, the child task starts at the same time the parent task starts, as long as it does not have dependencies with other child tasks.
  • If the parent task is set to Start ASAP and child tasks are set to Start on Specific Date, the earliest child task start date determines the start date of the parent, assuming no other dependencies. In this case, the parent's Time constraint field remains Start ASAP but the actual start date is changed to the start date of the earliest child task.
  • Child precedence also applies to end dates. If the child task's estimated end date is later than the parent task's end date, the parent task's estimated end date extends to cover the child. For actual values, a parent has the same start date as the earliest start date of its children and the latest actual end date as the latest end date of its children, assuming the child tasks are Closed Complete. If the child tasks are not in the Closed Complete state, the actual end date of the parent is empty.
  • For the planned start date of the parent task:
    • The planned start date is the earliest planned start date of all the children that do not have an actual start date.
    • If all child tasks have actual start dates, the parent task's planned start date is set to the actual start date.
  • For the planned end date of the parent task, the latest planned end date or actual end date of the child tasks determines the parent's planned end date.
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