March 2016 - IRIS v4.0 Released (current version)
Immaterial change. Minor revision to metric name and definition language for clarity.
March 2014 - IRIS v3.0 Released
November 2011 - IRIS v2.2 Released
February 2011 - IRIS v2.1 Released
New metric. Departing Permanent Employees (OI4499) developed via IRIS Taxonomy Development Group.