Key Performance Indicators (KPIs) are used to measure and monitor the effectiveness of a process within an organization. In this case, the internal auditor found that 3% of payments did not match submitted invoices, which indicates a potential control weakness in the accounts payable process.

Process Owner’s Tolerance for Performance Deviations (Correct Answer: A)

The most relevant KPI would be one that sets acceptable error limits for invoice payments.

IIA Standard 2120 – Risk Management states that auditors should assess management's risk tolerance and evaluate whether processes are operating within acceptable limits.

If the organization's threshold for errors is 1% and the audit found 3%, it indicates a significant issue requiring corrective action.

This KPI helps the auditor assess materiality and determine the significance of the 3% deviation.

Why the Other Options Are Incorrect:

B. KPI defining the importance of performance levels and disbursement statistics (Incorrect)

While understanding performance levels and disbursement statistics is useful, this KPI does not directly address error tolerance or the impact of deviations.

C. KPI defining timeliness of reporting disbursement errors (Incorrect)

Reporting errors quickly is important, but this KPI does not help in determining whether a 3% error rate is acceptable or excessive.

D. KPI defining operating ratio objectives (Incorrect)

Operating ratio objectives focus on financial efficiency rather than error tolerance or accuracy in invoice processing.

IIA Standard 2120 – Risk Management (Assessing risk tolerance in financial processes)

IIA Standard 2210 – Engagement Objectives (Evaluating process performance against defined thresholds)

IIA Standard 2130 – Compliance (Ensuring adherence to financial control policies)

Step-by-Step Justification:IIA References for This Answer:Thus, the best answer is A. A KPI that defines the process owner's tolerance for performance deviations, as it directly helps the auditor assess the materiality of the 3% error rate in accounts payable.