Before revision: TL 9000 is defined by two documents: TL 9000 Requirements Handbook, whose current release 6.2 includes the full text of ISO 9001:2015 TL 9000 Measurements Handbook, whose most recent release was 5.6 Reports on defect tracking and other measurements at various levels of granularity are accumulated by TL 9000 compliant facilities of certified organizations by the University of Texas at Dallas, which is the official TL 9000 administrator.
After revision: TL 9000 is defined by two documents: TL 9000 Requirements Handbook, whose current release 6.2 includes the full text of ISO 9001:2015 TL 9000 Measurements Handbook, whose most recent release was 5.7 Reports on defect tracking and other measurements at various levels of granularity are accumulated by TL 9000 compliant facilities of certified organizations by the University of Texas at Dallas, which is the official TL 9000 administrator.