Understanding Organizational Structures in Internal Audit:

A flat organizational structure has fewer levels of management, leading to faster decision-making, less bureaucracy, and lower administrative costs.

A hierarchical structure has multiple levels of management, which may improve control and oversight but increases complexity and costs.

Why a Flat Structure Reduces Operating and Support Costs:

Fewer management layers mean fewer salaries and reduced administrative expenses.

Streamlined decision-making reduces inefficiencies in reporting and communication.

Leaner support functions lead to cost savings in internal audit activity.

Why Other Options Are Less Relevant:

B. Stable and collaborative environment: Collaboration depends on culture, not just structure. Hierarchical models can also be collaborative.

C. Enables field auditors to report to senior auditors: This is more common in hierarchical structures where clear reporting lines exist.

D. More dynamic with advancement opportunities: Hierarchical structures often provide clearer career progression due to well-defined promotion paths.

IIA Standard 2030 – Resource Management: Encourages optimizing resources, which a flat structure can support.

IIA Practice Guide on Effective Internal Audit Governance: Discusses structural efficiency and cost control in internal audit.

COSO’s Internal Control Framework: Emphasizes efficient resource allocation in governance structures.

Relevant IIA References:✅ Final Answer: A flat structure results in lower operating and support costs than a hierarchical structure (Option A).