The Department of Labour is currently consulting on whether ACC should adopt the 6th Edition of the American Medical Association Guidelines to the Evaluation of Permanent Impairment over the currently used 4th edition, through proposed amendments to the Injury Prevention, Rehabilitation, and Compensation (Lump Sum and Independence Allowance) Regulations 2002. The consultation paper refers to a 2009 trial conducted by ACC which illustrates that a change in editions will have some impact on the impairment assessment. The consultation paper records that ACC wishes to adopt the 6th Edition as the assessment tool because, among other things, it considers that it is more consistent and accurate, easier to use, produces less extreme results, and is the "most up-to-date tool that provides best clinical practice". Further information is available here. Submissions are due by 21 November 2011.