The Task Path button can be found on the Format Ribbon and when you click it, you have four options: Predecessors, Driving Predecessors, Successors and Driven Successors. The first two are explained below and from that you will understand the last two.
When you highlight a task and then select Predecessors, all tasks that are directly or indirectly linked to the task will be highlighted in yellow. Follow the steps below to see for yourself:
1. Highlight the task you want to focus on.
2. Go to the Format Ribbon and click on Task Path.
3. Select Predecessors.
4. View all directly or indirectly linked predecessors on the Gantt Chart:
The difference between ‘Predecessors’ and ‘Driving Predecessors’ is simple. All of the predecessors include tasks that can slip without impacting the selected task. All of the Driving Predecessors will directly impact the selected task if they slip at all. To highlight Driving Predecessors, follow the steps above but select Driving Predecessors in step 3. Notice the difference in the tasks that are highlighted:
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