x interviews with different executives responsible for the information in the x verification, based on testing, that the data included in the 2016 Sustainability Report is consistent with the documentary evidence reviewed and/or comes from verifiable supporting information sources; x verification that the greenhouse emissions inventory information has been verified by an independent third party; x verification that the financial information included in the 2016 Sustainability Report is derived from accounting records or from audited financial statements as of December 31, 2016 by another firm of independent auditors.