Who initiated it and who has done what work (and when) on this task so far.
What’s the status, priority and due date. And along the way, who has set or changed these values and when.
Which documents are relevant to the task at hand.
So when the task is assigned to you, you'll have a clear work statement and task history. And when you are done with your portion of the work and pass it on to the next person, you'll have a permanent place to document what you’ve done and what you would like the next person to do.