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External Assurance

Environmental and Social Impacts

Many organization leaders are challenged to look at risk in new ways: from discerning and calculating real risk versus perceived threats, to accurately anticipating any potential impact on the state of competitiveness or business continuity.




The very nature of what constitutes risk is changing as the rules of engagement – locally and globally – have been shifting dramatically. Hyperactivity from regulatory forces and oversight bodies can reduce the clarity and predictability needed for sound decision making. The pace and scope of innovation, particularly with new technologies, is disrupting business models and historic operating paradigms; social media has empowered stakeholders with greater visibility on a range of organization behaviors; global networks have created new interdependencies between business and public interests; transparency is now an imperative with supply chains in order to achieve new efficiencies and ensure resiliency.

With sustainability reporting increasingly integrating financials in addition to operational issues such as environmental impacts,  human capital management and sourcing standards in the supply chain, establishing the trust and confidence of the markets is paramount. Investors, regulators, customers, suppliers and the public at large have become dependent upon thorough, reliable data and its communication in order to assess the integrity of an organization’s performance.

Organizations need assurance that the sustainability policies, processes and claims they have established along with their responsibility agenda, will withstand scrutiny and the impact of externalities beyond their control. They need to be equipped with the knowledge and analytics necessary for validating that any environmental, social and governance practices, and management systems are aligned with the strategic goals and projected outcomes.



ISOS Group guides organizations through the analysis and verification of their sustainability practices, public disclosures, and regulatory adherence. We apply proven techniques and the most appropriate measures for your particular technology, regulatory and business context: robust metrics, precise evaluation tools and comprehensive assurance mechanisms.

ISOS offers a number of External Assurance services, including:

  • External Assurance of GRI sustainability Reporting
  • External Verification or Assurance of climate change and Greenhouse Gas data submitted through the CDP Questionnaires: Climate Change, Water, Supply Chain
  • External Verification or Assurance of public disclosures submitted through the Global Real Estate Sustainability Benchmark (GRESB)
  • External Verification or Assurance of public disclosures submitted through the Dow Jones Sustainability Index (DJSI) Investor Questionnaire

We bring a unique approach by addressing the specific needs of your business and providing value beyond the delivery of an Assurance Statement. Our multi-disciplinary team of auditors works with the Client to identify opportunities for improving practices and performance, and providing organizations with the credibility sought after by stakeholders.The scope of the assurance can be varied by either verifying all elements of a report or specific metrics as defined by the interested party.

We typically base our assurance on international recognized standards including the AA1000 AS, ISO14064, ISAE 3000 Assurance Standard, SA8000, and the Global Reporting Initiative G4 Principles. The output produces new credibility for your sustainability efforts, helping to ensure a clearer path for your competitive agenda.



Our expert review of systems and processes used to support disclosure result in either of the following depending on disclosure platform and purpose:

  • External Assurance Statement to be submitted to GRI for level recognition and attached as an Appendix to your sustainability report
  • CDP Verification Statement to be included in the CDP Investor Questionnaire
  • GRESB Verification Statement to be included in the GRESB Investor Questionnaire
  • DJSI Verification Statement to be included in the DJSI Investor Questionnaire
  • Issues log and customized recommendations for corrective actions
  • Internal Verification report for management team highlighting areas that could benefit from further improvement, and prescription for success for the next reporting cycles




Using a sustainability framework effectively enables sustainability teams to inform larger organizational and procedural change, while also leveraging the credibility needed to leverage value from the overall non-financial reporting process. In addition, it:

  • Provides confidence that high quality of reporting practices has been achieved
  • Ensures compliance with established sustainability standards and reporting frameworks including GRI, CDP, GRESB, and DJSI
  • Improves internal disclosure processes for meeting reporting requirements
  • Validates the consistent use of reporting procedures and standards
  • Identifies discrepancies or inefficiencies in data management that can produce risk liabilities you may not have considered – such as calculations and computation processes used for verification


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