To determine if loans were granted in accordance with the organization's policies, the most effective approach is to validate a sample of loans against the applicable underwriting guidelines. This method allows the auditor to directly assess compliance with the specific criteria set out in the organization's loan granting policies, providing clear evidence on whether the loans meet the required standards.
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The Institute of Internal Auditors (IIA) Practice Guide: Auditing Credit Risk Management IIA Standard 2210 - Engagement Objectives

An The top-down approach to understanding business processes is conducted from a broad organizational perspective, beginning with the overall objectives and strategic goals of the organization and then drilling down into the specific processes that support these goals. While this approach ensures alignment with the organization's objectives, it has the greatest risk of overlooking critical processes at the lower levels, especially those that might be operationally significant but not directly linked to top-level objectives.
IIA References:
* IIA Standard 2010: Planning suggests that internal auditors should understand the organization's business processes in relation to its objectives. The top-down approach aligns with this but can risk missing important operational details that might be captured through a more granular (e.g., bottom-up) approach.

According to IIA guidance, if the internal audit team lacks the necessary skills and knowledge to perform an audit, the CAE should consider obtaining external expertise. Accepting the engagement and hiring an external expert allows the internal audit activity to leverage specialized knowledge while fulfilling the audit request.
This approach ensures that the audit is conducted effectively and meets the required standards, while also addressing any competency gaps within the internal audit team.
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Institute of Internal Auditors (IIA) Standards: Attribute Standards 1210: Proficiency IIA Practice Guide: Obtaining External Assistance in the Conduct of Internal Auditing

When establishing the objectives of an assurance engagement, it is crucial for internal auditors to align the engagement objectives with the concerns and priorities of operational management. By meeting with operational management, the internal auditor can gain insights into any specific areas of concern, operational challenges, and potential risks. This collaborative approach ensures that the engagement objectives are relevant and focused on areas that provide the most value to the organization, facilitating a more effective and targeted audit process.
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The Institute of Internal Auditors (IIA) - Standards for the Professional Practice of Internal Auditing, Standard
2201 - Planning Considerations

According to IIA guidance, when the internal audit activity investigates potential ethics violations in a foreign subsidiary, communication of any internal ethics violations to external parties may occur, but only with appropriate safeguards. This ensures that sensitive information is protected and that the organization complies with both local and international legal requirements. Cross-cultural differences and local laws must be considered, but the primary focus is on maintaining appropriate safeguards during communication.
References: IIA Practice Guide - Auditing Ethics Programs, IIA Standard 2440 - Disseminating Results