# Why are the successors not scheduling?

Successors are Tasks set to take place after another Task. There are a few reasons why your successor may not be rescheduling following a change to a predecessor Task:

1. The successor is **Done**, meaning that the Task dates have been actualised. No date changes can be made to Done tasks.
2. The successor is **Promised** and you are not the Task Owner, Assignee or Admin.
3. The task you moved is **Planned**, and the successor is **Promised.**