Today, I will show you how can you see driving Tasks in Microsoft Project for the Web.
First I will crate new Project:
As you can see, Task 3 has two Predecessors: Task 1, and Task 2. If I look at the Task3 Details, I will see:
On the Task’s detail page I can see all Predecessor Tasks, and also I can find information of which Task, or Tasks are “drivers”. In my example, Task 2 is Driving Task, because it determines the “schedule”, or in other words, it determines Start Date of it Successor (Task 3).
If I change Duration of the Task 1 to 5 days, for example, I will get:
As you can see now, Task 1 has become the Driving Task, because it determines Start Date of Task 3!
Finally, if I change both, Task 1 and Task 2 duration to, for example 4 days, I will get:
As you can see, now both Tasks (1 and 2) are Drivers for The Task 3, as you can see on the picture above.
Simple, and useful!