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. Individuals Receiving Training: Group-Based Training (PI7997) replaced Group-based Training (PI7997). Minor revision to metric name and definition language for clarity.
November 2011 - IRIS v2.2 Released
February 2011 - IRIS v2.1 Released
September 2010 - IRIS v2.0 Released
Immaterial change. IRIS ID changed due to framework upgrade. Minor revision to definition language for clarity.
September 2009 - IRIS v1.0 Released
New metric. Group-based Training (CD18) developed via Original IRIS Working Group.