Performance

Assurance

Our Corporate Assurance function has accountability and responsibility for providing internal assurance to the board that:

• Rio Tinto's policies, standards and controls as endorsed by the board are adequately designed and effective for their intended purpose; and that
• these policies, standards and controls are consistently implemented by all Rio Tinto sites on a timely basis and as designed.

In addition, we engaged an independent external assurance organisation to provide assurance over selected Group performance data included in the Sustainable development section of the 2008 Annual report. The data that have been externally assured are explained in the Assurance report below.

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