March 2016 - IRIS v4.0 Released (current version)
Immaterial change. Minor revision to metric name and definition language in order to align consistency of metric with catalog's structure and style as well as add an answer option.
March 2014 - IRIS v3.0 Released
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. Customer Model (DES9) developed via Original IRIS Working Group.