March 2016 - IRIS v4.0 Released (current version)
Immaterial change. Minor revision to usage guidance for clarity.
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. IRIS ID changed due to framework upgrade. Metric modified to expand information base by including number of Independent members.
September 2009 - IRIS v1.0 Released
New metric. Board of Directors: Independence (OG1.3) developed via Original IRIS Working Group.