What is the Three Lines Model for risk management

Effective risk governance requires every line to know its role.
June 10, 2026
Ivar van Duuren

As a security officer, it is essential to keep abreast of the latest developments in risk management. An important model that has been receiving increasing attention recently is the Three Lines Model (3LM).In this article, we tell you more about what 3LM entails, how it compares to the better-known Three Lines of Defence (3LOD) model, and why it is so important for effective information security.

What does the Three Lines Model entail?

The Three Lines Model is a risk management and governance framework introduced by the Institute of Internal Auditors (IIA) in July 2020. It builds on the older Three Lines of Defence model but makes some important improvements.At its core, the 3LM divides risk management responsibilities across three lines within an organization:

  1. The first line: Operational management - responsible for managing risks in day-to-day business activities.
  2. The second line: Risk management and compliance functions - support and challenge the first line in managing risks.
  3. The third line: Internal audit - provides independent assurance on the effectiveness of governance, risk management, and internal controls.

A key improvement of 3LM over 3LOD is that it puts more emphasis on collaboration and shared responsibility between the three lines. Instead of strict separation, 3LM encourages continuous communication and cooperation between the lines to effectively identify and manage risks.Another important aspect of 3LM is its emphasis on a flexible, tailored approach. It recognizes that organizations vary in size, complexity, and risk profile. The model is therefore adaptable to each organization's specific needs and context.

Relationship with the Three Lines of Defence model

The Three Lines of Defence model has long been the standard for risk management. It also divides responsibilities into three lines, but in a slightly different way from 3LM:

  1. The first line: Operational management - owners of risks and responsible for implementing corrective actions to address risks.
  2. The second line: Risk management and compliance functions - facilitate and monitor the implementation of effective risk management practices by operational management.
  3. The third line: Internal audit - provides independent assurance on both the first and second lines of defense.

While 3LOD is still a valuable model, 3LM acknowledges some of its shortcomings. 3LOD can lead to too strict a separation between the lines, missing opportunities for collaboration and shared responsibility as an organization. Moreover, it does not sufficiently take into account the diversity of organizations.3LM builds on the strengths of 3LOD, but corrects these shortcomings. It emphasizes more collaboration and flexibility while retaining the core principles of clear responsibilities and independent assurance.

Importance of 3LM for information security

Information security is a crucial part of risk management for any modern business, especially in the tech sector. The Three Lines Model is particularly relevant for security officers because it provides a clear framework for managing security risks.By applying the principles of 3LM, you ensure that information security is a shared responsibility across the organization. This is essential because security risks are not just a matter for the security team but for everyone working with sensitive data and systems.With 3LM, the first line (operational management) actively works to identify and manage security risks in their daily activities. The second line (security functions) supports them in this with expertise, policy, and monitoring. The third line (internal audit) provides independent control and advice to continuously improve the security approach.This integrated approach helps avoid blind spots and ensures that security is embedded in all aspects of business operations. It enables organizations to be proactive in identifying and addressing security issues, rather than just reactive when incidents occur.Moreover, 3LM recognizes that security risks are rapidly evolving, especially in the tech sector. By emphasizing flexibility and continuous improvement, the model helps organizations stay agile and adapt to the changing threat landscape.

10 Tips for implementing 3LM within your organization

The Three Lines Model (3LM) is an important framework for effective risk management and governance within organizations. As a security officer, you play a crucial role in the implementation of this model. Here are some tips to help you implement the model properly.

1. Provide a clear vision and strategy

Start by formulating a clear vision and strategy for the implementation of 3LM. Define the objectives, scope, and timeline of the project. Communicate this clearly to all stakeholders to create support.

2. Involve senior management

Support from senior management is essential for the successful implementation of 3LM. Make sure they understand the value and necessity of the model. Keep them regularly informed of progress and results.

3. Define roles and responsibilities

Clearly define roles and responsibilities within the three lines of 3LM. Who is responsible for identifying and managing risks (first line), who monitors and provides support (second line), and who performs independent audits (third line)? Make sure everyone understands their role.

4. Offer training and awareness

Organise training sessions and workshops to familiarise staff with 3LM and their specific responsibilities. Create awareness about the importance of risk management and how 3LM contributes to it. Encourage a culture where risk-aware thinking and acting is the norm.

5. Integrate 3LM into existing processes

Do not implement 3LM as an isolated project, but integrate it into existing processes and systems. Take a critical look at current working practices and adapt them to 3LM principles where necessary. Make use of existing consultation structures and reports.

6. Appoint clear risk owners

For each identified risk, appoint a clear risk owner within the first line. This person is responsible for assessing, controlling, and monitoring the risk. Ensure that risk owners have appropriate knowledge, resources, and authority.

7. Implement effective control mechanisms

Design and implement effective control mechanisms to manage risks. Consider preventive, detective, and corrective measures. Ensure that these controls are proportionate and practicable. Test and evaluate the effectiveness of controls regularly.

8. Improve continuously based on insights

Use insights and findings from the second and third lines to continuously improve. Analyse trends, identify areas for improvement, and draw up action plans. Share lessons learned and best practices within the organization. Strive for a culture of continuous improvement.

9. Communicate regularly and transparently

Communicate frequently and transparently about the progress, successes, and challenges of the 3LM implementation. Share relevant information with all stakeholders, including senior management, risk owners, and internal audit function. Use dashboards and reports to provide insight into the status of risks and control measures.

10. Evaluate and optimize periodically

Periodically evaluate the effectiveness of 3LM within your organization. Check whether the intended objectives are achieved and whether there are opportunities for improvement. Adjust the model and implementation based on changing circumstances and new insights. Strive for an optimal balance between the three lines.

Conclusion

By applying these 10 tips, you will lay a solid foundation for a successful implementation of 3LM within your organization. As a security officer, you play a key role in this process. Through a clear vision, management commitment, clear roles and responsibilities, effective controls, and continuous improvement, you create a strong risk culture and governance structure.Ultimately, the goal is to create an organizational culture where everyone feels ownership of information security and works together to manage risks effectively. Using the Three Lines Model as a guide, you can drive this culture change and thus strengthen your organization's digital resilience.

ISOPlanner™ supports risk management structures built around the Three Lines Model, with role-based task management and control oversight across all three lines.

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