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Stratified sampling is a technique that involves dividing a population into subgroups (strata) that share similar characteristics and then taking a sample from each subgroup. In the context of testing purchase transactions by different procurement officers, the transactions can be stratified based on the officers, ensuring that the audit team selects a sample that represents each officer's transactions. This method helps in achieving a more accurate and reliable assessment of the procurement process across all officers.References:

The Institute of Internal Auditors (IIA), Practice Guide on Sampling

"Auditing and Assurance Services: An Integrated Approach" by Alvin A. Arens, Randal J. Elder, Mark S. Beasley

To determine whether company vehicles are being used for personal purposes, the auditor needs location and route data of the vehicles in addition to the initial data extracted. This additional information would allow the auditor to track the specific routes and destinations of the vehicles, making it possible to identify patterns of use that do not align with business purposes, especially during weekends. The location and route data can help in pinpointing any non-business-related usage of the vehicles, providing evidence of personal use.

References:

IIA Practice Guide: "Auditing Operational Activities"

COSO Internal Control – Integrated Framework

When preparing a detailed risk assessment during engagement planning, the internal auditor should collaborate with the management of the function being reviewed. Management has the most in-depth knowledge of their business objectives, processes, and the associated risks. This cooperation ensures that the risk assessment is comprehensive, accurate, and relevant to the specific context of the function under review. It also helps in identifying any potential areas of concern that might not be evident to external parties.

References:

IIA Standard 2201: "Planning Considerations"

IIA Practice Guide: "Assessing the Adequacy of Risk Management Processes"

To identify a personal conflict-of-interest situation affecting an organization’s procurement function, inspecting documents is the most effective engagement technique. This involves reviewing relevant documentation such as procurement records, conflict of interest disclosures, vendor contracts, and employee relationships with vendors. This technique provides concrete evidence and can reveal discrepancies or relationships that suggest a conflict of interest, offering a clear and objective basis for any findings.References:

The Institute of Internal Auditors (IIA) - Standards for the Professional Practice of Internal Auditing, Standard 2310 - Identifying Information