The most recent standard to be reviewed and updated is the Instructor Trainer Standard. Originally developed in 1993, the Instructor Trainer Standard was revised to stay consistent with the wording changes that have taken place with the Instructor, Open Water Diver, the Introduction to Scuba standards, Dive Supervisor standard and, most recently the Assistant Instructor Standard.
Notable change that was made is:
Candidates must have a broad base of teaching background and have taught at least 150 divers.
These standards were approved in October 2003 and in effect as of January 1, 2004.