The study was based on assessing the preferences of 15 key decision makers from heavyweight firms across seven countries, with the assurance providers assessed across 63 criteria. Other firms that rated highly included accountancy firms KPMG and Deloitte.

In the Australian marketplace, Bureau Veritas is one of the key firms providing certification, assessment and auditing for Environmental Management Systems ISO 14001 certification, in addition to Social Accountability Certification SA 8000, sustainability assessment and carbon emission assessment and verification services.