This report (Report 2009/13) was prepared by Thinkwell Australia for E3 in consultation with the Department of the Environment, Water, Heritage and the Arts (DEWHA) and based on data collected in the course of a testing program run on behalf of DEWHA by Pitt&Sherry. The Department of the Environment, Water, Heritage and the Arts (DEWHA) commissioned expert test facilities to confirm the energy efficiency claims by major-brand computer suppliers. Desktop (DT) and notebook (NB) computers were bought on the open market, guided by information available to consumers, noting particularly any claims of ENERGY STAR® compliance.The computers purchased all claimed compliance with the global ENERGY STAR (E) scheme developed by the US Environmental Protection Agency (EPA) some 15 years ago. Retailers were requested to supply either E* version 4 (E*V4.0) which commenced in 2007 or E* version 5 (E*V5.0) the most recent high efficiency standard that commenced in July 2009.