March 2016 - IRIS v4.0 Released (current version)
March 2014 - IRIS v3.0 Released
Immaterial change. 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. Operating Expense (FP1001) replaced Operating Expenses (OPEX) (F4). IRIS ID and metric name changed due to framework upgrade. Minor revisions to definition language for clarity.
September 2009 - IRIS v1.0 Released
New metric. Operating Expenses (OPEX) (F4) developed via Original IRIS Working Group.