When planning the task network having the successor visible is extremely useful.  I don't see this column as a choice.  Please add it.

Thanks for your reply.  This is not what I am referring to though. 

In your screen shot, lets assume that task 2 has a predecessor or task 1 and task 3 has a predecessor of task 1 as well,

Task 3 has a predecessor of task 2.

If there were a Successors column, then the value of the Successor for task 1 would show 2, 3

The value of Successor for task 2 would be 3.

Task 3's Successor value would be blank.

Best practice in scheduling is that every task, except the last one, should have at least one successor.  Having visibility of the successors would enable this best practice.