An assurance engagement provides an independent assessment of governance, risk management, and control processes. In this case, including the effectiveness of oil price risk management in the annual audit plan as an assurance engagement would allow the internal audit activity to evaluate the controls and processes in place for managing this significant risk. Even though the financial risk committee regularly addresses market risks, an independent review by internal audit can provide additional assurance to stakeholders about the effectiveness of these risk management practices. References: The IIA's International Standards for the Professional Practice of Internal Auditing (Standards), specifically Standard 2010 - Planning, and Standard
2130 - Control.