You are audit in-charge of Marble Limited. The company has established an internal audit function, which is headed by a Chartered Accountant, who has significant internal audit experience. The head of internal audit also reports functionally to audit committee and administratively to the Chief Executive. Based on your preliminary review of the internal audit function, you consider that internal auditing activities are relevant to the risk assessment, and therefore, you are planning to obtain understanding and perform an assessment of internal audit. What are the important criteria that you would consider for assessment of internal audit function?