Re: How to audit confidential business plan?
This is pretty common.
Most companies have business plans that are not shared with people outside of the company. Sometimes it is only shared with a select group inside the company. Rightfully so.
So, you would look for evidence that quality objectives exist, are they tracked, is there a goal, are they discussed in the management review, what are the results, are there action plans if target are not met.
You would search for objective evidence.