A formal risk management framework facilitates a methodical approach to risk mitigation (1), defines and standardizes the terminology used in risk communication (2), and facilitates the alignment of risk mitigation strategies with management priorities (4). These aspects help ensure that risk management efforts are consistent, well-understood, and integrated into the overall strategic direction of the organization.
IIA guidance on implementing risk management frameworks

The use of due professional care by the internal audit activity is best demonstrated by internal auditors undertaking the necessary training to complete their audit work. Due professional care involves applying the diligence and judgment needed to conduct audits effectively. This includes continuous training and development to ensure auditors are proficient in their field and up-to-date with relevant audit standards, technologies, and methodologies, which aligns with the International Standards for the Professional Practice of Internal Auditing from the Institute of Internal Auditors (IIA).
The Institute of Internal Auditors (IIA) - International Standards for the Professional Practice of Internal Auditing

Conformance with The IIA's Code of Ethics is mandatory for internal auditors because it provides the basis for stakeholder trust and confidence in the validity of the profession of internal auditing and the internal audit activity's findings. Ethical behavior in internal auditing ensures that auditors are trusted by those who rely on their conclusions, advice, and information, thereby enhancing the integrity and credibility of the audit results.
Institute of Internal Auditors (IIA) - International Professional Practices Framework (IPPF)

Due professional care was applied by the internal auditor. According to IIA guidance, due professional care involves applying reasonable judgment in all audit circumstances. The auditor's decision to extend the scope of testing based on a fraud risk assessment, even though no issues were initially found, represents a judicious use of professional judgment given the potential risk of fraud. The fact that fraud was later discovered does not necessarily imply a lack of professional care, as audits cannot guarantee the detection of all frauds.
IIA Standard 1220 - Due Professional Care

According to IIA guidance, an appropriate role for the internal audit activity includes coaching management in responding to risks. This involves advising, counseling, and providing insights based on analyses and assessments in a way that adds value and improves an organization's operations without assuming management's responsibilities. Implementing risk responses, imposing risk management processes, or setting the risk appetite would compromise the independence of the internal audit function.
Institute of Internal Auditors (IIA) - International Professional Practices Framework (IPPF)