A Complete Practical Guide to the NIS2 Directive for Organizations Across the EU
The NIS2 Directive is the most significant update to Europe’s cybersecurity legislation in years.
It redefines how organizations across the EU must manage risk, protect critical services, and report incidents — not as a formality, but as a measurable and enforceable standard of operational resilience.
The series “NIS2 – How to Be Compliant” consists of eight practical articles based on the open-access publication “NIS2 – How to Be Compliant v1.3” by Wojciech Ciemski.
Each article explains in simple but precise language what compliance with NIS2 truly means — from understanding the scope and governance requirements, through incident reporting and supplier risk, to auditing, KPIs, and readiness proofs.
After the eighth part, the complete all-in-one guide will be published, followed by a NIS2 Glossary covering all key terms, abbreviations, and concepts used in the directive.
Who is this series for?
- CISOs, IT Managers, and Compliance Officers implementing NIS2 requirements in their organizations.
- Auditors, consultants, and managed service providers supporting NIS2 readiness and verification.
- Entities covered by NIS2, including operators in energy, transport, health, administration, and digital services.
- Anyone who wants to clearly understand what compliance with NIS2 actually means in practice.
NIS2 – How to Be Compliant: Article Overview
Below is the list of all articles in the series, with short descriptions and space for future links once they are published.
1. What NIS2 Really Means – Scope, Entities and Impact
Description: An introduction to NIS2. Who is affected, what types of entities fall under its scope, and how the directive changes the security obligations of organizations across the EU.
Keywords: NIS2 Directive, essential entities, important entities, NIS2 scope, EU cybersecurity regulation.
[Read the article → link to post]
2. Governance and Risk Management under Article 21
Description: How to implement risk management and establish governance structures in line with Article 21 of NIS2. Practical guidance for CISOs and executives.
Keywords: NIS2 governance, Article 21, risk management, RASCI matrix, NIS2 compliance framework.
[Read the article → link to post]
3. Incident Reporting under NIS2 – How to Handle the 24h/72h Rule
Description: When and how to report incidents under NIS2. Understanding the 24h/72h/30-day model, notification forms, and communication channels with CSIRTs and NCAs.
Keywords: NIS2 incident reporting, 24-hour notification, CSIRT, NCA, incident response workflow.
[Read the article → link to post]
4. Supply Chain and Third-Party Risk – The Forgotten Pillar of NIS2
Description: How to assess supplier security, manage third-party risks, and build a compliant supply chain assurance process.
Keywords: NIS2 supply chain, vendor assessment, third-party risk, due diligence, compliance audit.
[Read the article → link to post]
5. The Technical Core of NIS2 – Essential and Organizational Measures
Description: Ten key security measures required by NIS2, including MFA, patch management, backups, monitoring, and vulnerability management.
Keywords: NIS2 technical measures, organizational controls, ISO 27001, cybersecurity standards, resilience.
[Read the article → link to post]
6. Measuring Security – KPIs, Metrics and Continuous Improvement
Description: How to measure cybersecurity performance under NIS2, set meaningful KPIs, and maintain evidence of continuous improvement for audits.
Keywords: NIS2 audit, cybersecurity KPIs, metrics, performance measurement, continuous improvement.
[Read the article → link to post]
7. Sector-Specific Implementation – What NIS2 Means for Energy, Health and Digital Services
Description: How NIS2 is being implemented across different sectors and EU countries, with practical examples and national interpretations.
Keywords: NIS2 sectors, energy, healthcare, transport, digital infrastructure, national implementation.
[Read the article → link to post]
8. The Ultimate NIS2 Compliance Checklist – How to Prove You’re Ready
Description: A full checklist and 12-week roadmap for implementing NIS2. Documentation examples, registers, and evidence required during audits.
Keywords: NIS2 checklist, compliance plan, audit preparation, documentation, risk register.
[Read the article → link to post]
9. NIS2 – How to Be Compliant (Complete Guide)
Description: The complete version combining all eight articles, enriched with additional templates, audit forms, and the NIS2 glossary.
Keywords: NIS2 compliance guide, EU directive, cybersecurity compliance, all-in-one handbook.
[Read the article → link to full guide]
NIS2 Glossary
Description: A comprehensive list of NIS2 terms, abbreviations, and definitions used in the directive and throughout this series.
Keywords: NIS2 glossary, NIS2 terms, definitions, abbreviations, cybersecurity vocabulary.
[Go to the glossary → link to post]
Publication plan
Each article will be published sequentially over the coming weeks.
Once the full series is complete, readers will have access to a consolidated NIS2 compliance handbook and a detailed glossary for practical reference.
Based on the open-access publication “NIS2 – How to Be Compliant v1.3” (Zenodo, 2025)
