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Three Lines of Defence

What is Three Lines of Defence?

A governance model that divides risk management responsibilities into three layers: first line (business operations and management controls), second line (risk management and compliance functions), and third line (internal audit).

Governance

Each of these is named in at least one of the same controls as three lines of defence. The number is how many controls name both.

What the standards actually require on three lines of defence

Requirements naming three lines of defence across 4 standards, quoted from the control text.

Three Lines of Defence. Cyber risk governance should follow a three lines of defence model (operational management; risk and compliance oversight; internal audit) (para 19).

BMA-5 · Three Lines of Defence

Implement governance + ISMS + risk + HR + lifecycle per MTCS SS 584 covering Information Security Management System (ISO/IEC 27001 alignment) + Risk Management (ISO 31000 + ISO/IEC 27005) + Human Resource Security (employment screening + training + termination...

MTCS-Governance-ISMS-Risk-HR-Lifecycle-Compliance-Cloud-Strategy-Roles-Responsibilities · MTCS Governance + ISMS + Risk Management + HR Security + Cloud Service Lifecycle + Compliance + Roles

Questions people ask about three lines of defence

What is Three Lines of Defence?
A governance model that divides risk management responsibilities into three layers: first line (business operations and management controls), second line (risk management and compliance functions), and third line (internal audit).
Why is Three Lines of Defence important for compliance?
Three Lines of Defence is a key concept in Governance. Understanding three lines of defence helps organizations meet regulatory requirements, reduce risk, and demonstrate due diligence during audits. Our compliance platform maps 686 frameworks with 311K cross-framework control mappings.
Which compliance frameworks address Three Lines of Defence?
Three Lines of Defence appears in the requirement text of IRM Enterprise Risk Management Framework (Institute of Risk Management), Bermuda Monetary Authority (BMA) Cyber Risk Management Code of Conduct, MTCS (Singapore), Monetary Authority of Singapore Technology Risk Management Guidelines. Across these standards we have identified 5 controls that name it directly, each linked to the control text on the compliance platform.
Where can I learn more about Three Lines of Defence?
Explore our compliance framework pages to see how three lines of defence applies across different standards and regulations. Our implementation guides provide step-by-step guidance, and the compliance platform offers AI-powered analysis of how this concept maps across 686 frameworks.

See how Three Lines of Defence applies across compliance frameworks

Our platform maps 686 frameworks with 311K cross-framework control mappings. Explore how this concept is addressed across standards.

Written and maintained by Gerard Blokdyk, The Art of Service.