In the old days , an audit for compliance to ISO 9001 was relatively straight forward. There were stated requirements. While there were interpretative issues, the 2000 revision has blurred things quite a bit. The change is from show me where you address this and explain the system the task is now directed at auditing for performance I believe we all know how subjective this can be.
Acquisition and use of data has gained significantly in importance. Serious emphasis is now being placed on how you evaluate and determine what and how to continuously improve. Evaluation of system effectiveness and possible ways to reduce costs are focused on.
ISO 19011 - Quality and Environmental Management Systems Auditing Forum Discussions