March 2016 - IRIS v4.0 Released (current version)
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. Recycled Materials (OI4328), Biodegradable Materials (OI5101) and Toxic Materials (OI5942) replaced Material Usage (OEN44). Metric trifurcated to better differentiate between materials used.
September 2009 - IRIS v1.0 Released
New metric. Toxic Materials (OEN44) developed via Original IRIS Working Group.