To ensure accuracy, completeness and reliability, this Report has been audited and certified – as a whole and in terms of every material issue – by an independent external certification body prior to publication. We inform our stakeholders that the documentation and certification of this Report was made in order to assure its compliance with the requirements of the GRI-G4 guidelines (in accordance with/Comprehensive Option). The independent body which reviewed the Report also certified that the Oil & Gas Sector Supplement indicators have been covered.

The result of this external verification (relevant certificates) is presented at http://sustainabilityreport2015.helpe.gr/en/operational-efficiencyperformance/GRI-G4-point/ (Appendix I), whereas the relevant certificates are presented below.

This Report also satisfies the requirements of the CoP Report (Advanced Level) of the UNGC (see Appendix II).

Furthermore, the accuracy of the data is assured through internal validation procedures and annual audits made by accredited certification bodies. These inspections and audits ensure that the Report is reliable, adequately balanced and relevant to the expectations and interests of the Group’s stakeholders.