Ditto what VWgirl stated... it is a living moving document IMO, and I encourage my auditor to manage the schedule as needed.
For example, we might have thought we would focus on one area in the first quarter, but then learn the software will be replaced at the end of the quarter. Tt would not be useful to the bank to review a process that will be dramatically revamped shortly after our review, so then we may consider moving it to the third quarter, or split it up and do two smaller reviews. Perhaps review the portions in the first quarter that would not be affected by the software change, and the rest in the third quarter once they have learned the new program and worked the kinks out.
If you feel more comfortable documenting the reasoning for the change, your complaince risk assessment will be a great means for that (as ours drives our audit schedule) as ours is live document as well.
_________________________
I don't repeat gossip, so listen closely...