The short version. Routing is the order people see the item. Anyone who already responded is locked — their response is part of the record and can’t be edited away.
Set up the route
1
Add reviewers in the order they should see it
Usually: the person who can actually answer, then whoever needs it for the record.
2
Keep it short
Every reviewer is a day. Two reviewers who can decide beats five who can comment.
3
Reorder before you send, not after
Rearranging mid-review is where things get confusing.
Locked reviewers
Changing the reviewer who holds the ball
Next
Answering an RFI
Responses vs. History.
Statuses and Ball in Court
The model behind all of this.