But the very largest Level 1 merchants don't get to use the honor system. Instead they must get an outside assessment, either by a Qualified Security Assessor (QSA, like me) or a member of their own staff who attended training and qualified as an Internal Security Assessor (ISA).
The QSA prepares a Report on Compliance (ROC, pronounced "rock"). This covers all of PCI. Moreover, the QSA needs to see multiple pieces of evidence before she/he can mark a requirement as "in place." The Council has released its updated guidance on just what the QSA does. It could make informative reading. It is now available for everyone to see.
Click here to download a copy of the ROC Reporting Instructions, then see how your own internal self-assessment measures up.