ASHRAE Journal, Mar. 2014, by Steve Ferguson.
http://bit.ly/1kH3Erg

"In 2013, ASHRAE participated in the development of the International Energy Conservation Code (IECC) published by the International Code Council (ICC). The IECC is a model energy code that is adopted in many jurisdictions across the United States. ANSI/ASHRAE/IES Standard 90.1 serves as an alternative compliance path in the IECC. In an effort to try to reduce confusion in the marketplace, and decrease the amount of training for designers and code officials, ASHRAE submits proposals and comments with the intent of trying to align the requirements in the IECC and Standard 90.1."