Should these four disciplines be applied sequentially?

No. Their intensity varies across the lifecycle, but they should operate in parallel. Risk starts with the decision, security accompanies design and implementation, and auditing should be considered from the outset so that the necessary evidence is produced.

Who is responsible for cybersecurity risk?

Each risk must have an owner responsible for monitoring and treating it. Acceptance of residual risk rests with the authority defined in the organisation’s governance model. Cybersecurity, project, cloud and audit teams provide information, but do not replace that responsibility.

Should cloud auditing take place only at the end?

No. Audit criteria and evidence requirements should be considered during planning to reduce gaps and avoid reconstructing documentation after implementation.

Does risk management replace technical security testing?

No. Risk management sets priorities and criteria. Technical tests verify assumptions, vulnerabilities and control effectiveness. The two activities are complementary.

What is NIS2 and who does it apply to in Portugal?

NIS2 is Directive (EU) 2022/2555, transposed into Portuguese law by Decree-Law no. 125/2025 of 4 December, which approved the new Legal Framework for Cybersecurity. It applies to essential and important entities in sectors considered critical or relevant, including energy, transport, healthcare, banking, digital infrastructures, public administration, among others. The framework entered into force on 3 April 2026.

Are ISO/IEC 27001 and NIS2 the same thing?

No. ISO/IEC 27001 is an international standard for information security management systems, whereas NIS2 is a European cybersecurity directive transposed into national law. Although they address related topics — such as risk, controls, incidents and responsibilities — they have different natures, scopes and purposes.

Does ISO/IEC 27001 certification help address NIS2?

Yes, it can help significantly. A well-implemented Information Security Management System — focused on risk management, controls, documentation, internal audit and continual improvement — supports a relevant part of the response to NIS2 and facilitates the demonstration of maturity. Even so, NIS2 includes its own regulatory requirements that require specific analysis, such as legal scope, entity classification, reporting obligations and interaction with the competent authorities.

What should professionals know about NIS2 and ISO/IEC 27001?

Information security, compliance, audit, risk and governance professionals need to understand both dimensions: the normative dimension, structured by ISO/IEC 27001, and the regulatory dimension, introduced by NIS2. Knowing how to articulate an Information Security Management System with the requirements of a cybersecurity legal framework — identifying overlaps, gaps and priorities — is an increasingly valued competence in the market.

What training covers NIS2 and ISO/IEC 27001?

Behaviour develops training in the areas of information security, cybersecurity and regulatory compliance. The learning paths cover both the normative dimension — implementation and auditing of Information Security Management Systems according to ISO/IEC 27001 — and the regulatory dimension, including the European cybersecurity framework and its practical application for different profiles and levels of responsibility.

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Cybersecurity obligations and requirements

NIS2 and ISO/IEC 27001: the same obligation or two different requirements?

NIS2 and ISO/IEC 27001 share a common vocabulary: risk, controls, incidents, responsibilities. But they do not have the same nature or the same purpose. Treating one as a substitute for the other is one of the most frequent misunderstandings, with practical consequences for organisations and professionals.

⏱️ Estimated reading time: 6 minutes

The entry into force of NIS2 reinforced an idea that many organisations already knew, but did not always treat with the necessary priority: cybersecurity is no longer merely a technical concern and has become a requirement of governance, risk management, operational continuity and management accountability.At the same time, many entities already had, or are preparing, information security management systems based on ISO/IEC 27001. This raises a frequent question:Is complying with ISO/IEC 27001 the same as complying with NIS2?The answer is clear: no. NIS2 and ISO/IEC 27001 are not the same obligation. But they are deeply related.

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NIS2 and ISO/IEC 27001: the same obligation or two different requirements?