What does QGM build on top of, and what is that layer shared with?

It builds on the CTS technical layer (CTS handles transport logistics), letting customers layer SAP's quality process onto existing CTS.

It can run standalone or combined with other tools (e.g. Transport Analytics to find TMS improvements, Change Diagnostics for cross-system comparison). The CTS layer is the common foundation of QGM, ChaRM, and Release Management.