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Accreditation of ratings, rankings, or indexes signals alignment with GISR’s Principles for sustainability ratings excellence and demonstrated suitability of the methodology for its stated audience and purpose. Through a voluntary process, GISR will invite rating organizations to apply for accreditation to specific, transparent criteria to evaluate alignment of their methodology(ies) with GISR’s 12 Principles. A draft model for accreditation will be released for public consultation in 2016.