March 2016 - IRIS v4.0 Released (current version)
Immaterial metric name change. Minor revision to metric name in order to align with the catalog's structure and style.
March 2014 - IRIS v3.0 Released
Immaterial change. Minor revision to definition language for clarity.
November 2011 - IRIS v2.2 Released
February 2011 - IRIS v2.1 Released
September 2010 - IRIS v2.0 Released
Material change. Total Employee Training Costs (OI7390) replaced Cost of Training (OT33). Metric modified to increase accuracy by expanding to include all employees, not just full-time.
September 2009 - IRIS v1.0 Released
New metric. Cost of Training (OT33) developed via Original IRIS Working Group.