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Version 4 of Interpreting Indicators of Rangeland Health, Technical Reference 1734-6, is the second published edition of this technique. It follows the recommendations published in Pyke et al. (2002). The indicators are unchanged from Version 3, allowing this document to replace Version 3 even in areas where the evaluation process has already begun. The changes in Version 4 are designed to improve the consistency in the application of the process. The most significant modification is the replacement of the Ecological Reference Area Worksheet with the Reference Sheet (Appendix 2). The Reference Sheet facilitates consistent application of the process on each ecological site by integrating all available sources of data and knowledge to generate a single range of reference conditions for each indicator. We have removed the Species Dominance Worksheet (Version 3, Appendix 4), since the information gained from this worksheet is similar to the information in the Functional/Structural Groups Sheet. We have included cells for noxious weeds and invasive plants in the Functional/Structural Groups Sheet (Version 4, Appendix 3). This allows users to continue to document the presence and abundance of invasive species for their records.