Usually, start with providers that could materially affect your service or data. For each relevant provider, ask:
- What does it do?
- What access does it have?
- What happens to our service if it fails?
If names or reports cannot be shared, ask for alternative evidence and record what remains unknown. Do not assume you have a direct audit right. Decide whether the remaining uncertainty is acceptable for the service you intend to use.
Read more: What Should We Ask a Vendor About Its Fourth-Party Dependencies?.