Information Security

ISO 27001 quick scan or gap check: how does it work?

Information Security

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Many organizations want to get started with information security, especially with the arrival of the Cybersecurity Act (NIS2), but are not sure where to start. The result is often a sense of overwhelm by the norm's 93 control measures. The solution? An ISO 27001 quick scan (also known as a “gap analysis” or “baseline measurement”). In this blog, we explain what a quick scan means, why it is the foundation of your ISMS and what you can expect from the process.

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This article was last updated on
20.04.2026
Written by
Twan
Haesen
Information Security Consultant

What is an ISO 27001 baseline measurement?

A baseline measurement is an in-depth inventory of the current status of your information security compared to the ISO 27001 standard. During this research, an expert not only looks at your IT systems, but also at your physical security, your personnel policy and your organizational processes.

The goal of the gap analysis is simple: to determine which gaps still need to be closed in order to become ISO 27001 compliant.

How does an ISO 27001 quick scan work?

A quick scan or gap check usually takes place in three clear phases:

1. Documentation research

The consultant looks at the documents that are already present. Consider your current security policy, privacy regulations (AVG) and any IT manuals.

2. Interviews and observations

The heart of the quick scan consists of conversations with key figures within your organization (such as the IT manager, HR and management). It is tested whether the paper reality matches daily practice in the workplace.

3. The report (the improvement plan)

You'll receive a detailed report. For each part of the standard, this states:

  • What's already going well.
  • Where the risks lie.
  • A concrete step-by-step plan to close the gaps found.

Why a gap check is important for NIS2

For companies that fall under NIS2 legislation, an ISO 27001 GAP check is an excellent way to demonstrate that they take their duty of care seriously. Because the NIS2 has a lot of overlap with ISO 27001, the quick scan immediately serves as a basis for your legal compliance.

The benefits at a glance

  • Cost savings: you don't waste time and money on measures that are not strictly necessary for your organization.
  • clearness: you get a realistic picture of the lead time and the required ISO 27001 costs.
  • Support: the report helps to convince management of the need for specific investments.

Conclusion: measuring is knowing

Starting an ISO 27001 journey without a baseline measurement is like sailing without a compass. A quick scan gives you back control and provides an efficient route to certification.

Curious about how your organization is doing? Avoid surprises during the audit and get immediate insight into your areas for improvement. Schedule an informal and free consultation now to discuss the possibilities of an ISO 27001 gap analysis for your company.

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