Task dependencies in Gantt

Modified on Fri, 27 Jun at 2:34 PM

Task dependency or task relationship can be established between two tasks in a Gantt chart. This dependency affects the project schedule. If you change the predecessor of a task, it will affect the successor task, which will affect the next task, and so on. Relationships can be established between parent-parent tasks, child-child tasks, parent-child tasks, and child-parent tasks.

Task relationship types

Task relationships are categorised into four types based on the start and finish dates of the task.

Start to Start (SS)

You cannot start a task until the dependent task also starts.

Start to Finish (SF)

You cannot finish a task until the dependent task is started.

Finish to Start (FS)

You cannot start a task until the dependent task is completed.

Finish to Finish (FF)

You cannot finish a task until the dependent task is completed.

Example