March 2016 - IRIS v4.0 Released (current version)
Immaterial change. Minor revision to definition language in order to align consistency of metric with catalog's structure and style.
March 2014 - IRIS v3.0 Released
November 2011 - IRIS v2.2 Released
February 2011 - IRIS v2.1 Released
September 2010 - IRIS v2.0 Released
Material change. Environmental Impact Objectives (OD 4108) and Social Impact Objectives (OD6274) replaced Development Objectives (DES7). Metric bifurcated to increase specificity by accounting for environmental and social objectives separately.
September 2009 - IRIS v1.0 Released
New metric. Development Impact Objectives (DES7) developed via Original IRIS Working Group.