This page and subpages will give you an overview of the principles of IBM z/OS mainframe IT auditing. It is presumed a large organization as described in the book: IT auditing: An object oriented approach by Margaret van Biene-Hershey is the organization as audited. Furthermore a lot of principles as described in the book : A Close look at MVS systems, written bij Ronald Paans are used for auditing. For review and first basic of the z/OSMainframe the book: What on earth is a Mainframe by: David Stephens will give you an overview of several systems and subsystems of z/OS and how they are connected.