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ISO 27001/ISO 22301 Knowledge base

ISO 27001 implementation checklist

Author: Dejan Kosutic

If you are starting to implement ISO 27001, you are probably looking for an easy way to implement it. Let me disappoint you: there is no easy way to do it. However, I’ll try to make your job easier – here is the list of sixteen steps you have to go through if you want to achieve ISO 27001 certification:

1. Obtain management support

This one may seem rather obvious, and it is usually not taken seriously enough. But in my experience, this is the main reason why ISO 27001 projects fail – management is not providing enough people to work on the project or not enough money. (Read Four key benefits of ISO 27001 implementation for ideas how to present the case to management.)

2. Treat it as a project

As already said, ISO 27001 implementation is a complex issue involving various activities, lots of people, lasting several months (or more than a year). If you do not define clearly what is to be done, who is going to do it and in what time frame (i.e. apply project management), you might as well never finish the job.


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3. Define the scope

If you are a larger organization, it probably makes sense to implement ISO 27001 only in one part of your organization, thus significantly lowering your project risk. (Problems with defining the scope in ISO 27001)

4. Write an ISMS Policy

ISMS Policy is the highest-level document in your ISMS – it shouldn’t be very detailed, but it should define some basic issues for information security in your organization. But what is its purpose if it is not detailed? The purpose is for management to define what it wants to achieve, and how to control it. (Information security policy – how detailed should it be?)

5. Define the Risk Assessment methodology

Risk assessment is the most complex task in the ISO 27001 project – the point is to define the rules for identifying the assets, vulnerabilities, threats, impacts and likelihood, and to define the acceptable level of risk. If those rules were not clearly defined, you might find yourself in a situation where you get unusable results. (Risk assessment tips for smaller companies)

6. Perform the risk assessment & risk treatment

Here you have to implement what you defined in the previous step – it might take several months for larger organizations, so you should coordinate such an effort with great care. The point is to get a comprehensive picture of the dangers for your organization’s information.

The purpose of the risk treatment process is to decrease the risks which are not acceptable – this is usually done by planning to use the controls from Annex A.

In this step a Risk Assessment Report has to be written, which documents all the steps taken during risk assessment and risk treatment process. Also an approval of residual risks must be obtained – either as a separate document, or as part of the Statement of Applicability.

7. Write the Statement of Applicability

Once you finished your risk treatment process, you will know exactly which controls from Annex you need (there are a total of 114 controls but you probably wouldn’t need them all). The purpose of this document (frequently referred to as SoA) is to list all controls and to define which are applicable and which are not, and the reasons for such a decision, the objectives to be achieved with the controls and a description of how they are implemented.

The Statement of Applicability is also the most suitable document to obtain management authorization for the implementation of ISMS.

8. Write the Risk Treatment Plan

Just when you thought you resolved all the risk-related documents, here comes another one – the purpose of the Risk Treatment Plan is to define exactly how the controls from SoA are to be implemented – who is going to do it, when, with what budget etc. This document is actually an implementation plan focused on your controls, without which you wouldn’t be able to coordinate further steps in the project.

9. Define how to measure the effectiveness of controls

Another task that is usually underestimated. The point here is – if you can’t measure what you’ve done, how can you be sure you have fulfilled the purpose? Therefore, be sure to define how you are going to measure the fulfilment of objectives you have set both for the whole ISMS, and for each applicable control in the Statement of Applicability.

10. Implement the controls & mandatory procedures

Easier said than done. This is where you have to implement the four mandatory procedures and the applicable controls from Annex A.

This is usually the most risky task in your project – it usually means the application of new technology, but above all – implementation of new behaviour in your organization. Often new policies and procedures are needed (meaning that change is needed), and people usually resist change – this is why the next task (training and awareness) is crucial for avoiding that risk.

11. Implement training and awareness programs

If you want your personnel to implement all the new policies and procedures, first you have to explain to them why they are necessary, and train your people to be able to perform as expected. The absence of these activities is the second most common reason for ISO 27001 project failure.

12. Operate the ISMS

This is the part where ISO 27001 becomes an everyday routine in your organization. The crucial word here is: “records”. Auditors love records – without records you will find it very hard to prove that some activity has really been done. But records should help you in the first place – using them you can monitor what is happening – you will actually know with certainty whether your employees (and suppliers) are performing their tasks as required.

13. Monitor the ISMS

What is happening in your ISMS? How many incidents do you have, of what type? Are all the procedures carried out properly?

This is where the objectives for your controls and measurement methodology come together – you have to check whether the results you obtain are achieving what you have set in your objectives. If not, you know something is wrong – you have to perform corrective and/or preventive actions.

14. Internal audit

Very often people are not aware they are doing something wrong (on the other hand they sometimes are, but they don’t want anyone to find out about it). But being unaware of existing or potential problems can hurt your organization – you have to perform internal audit in order to find out such things. The point here is not to initiate disciplinary actions, but to take corrective and/or preventive actions. (Dilemmas with ISO 27001 & BS 25999-2 internal auditors)

15. Management review

Management does not have to configure your firewall, but it must know what is going on in the ISMS, i.e. if everyone performed his or her duties, if the ISMS is achieving desired results etc. Based on that, the management must make some crucial decisions.

16. Corrective and preventive actions

The purpose of the management system is to ensure that everything that is wrong (so-called “non-conformities”) is corrected, or hopefully prevented. Therefore, ISO 27001 requires that corrective and preventive actions are done systematically, which means that the root cause of a non-conformity must be identified, and then resolved and verified.

Hopefully this article clarified what needs to be done – although ISO 27001 is not an easy task, it is not necessarily a complicated one. You just have to plan each step carefully, and don’t worry – you’ll get your certificate.

Here you can download the diagram of  ISO 27001 implementation process showing all these steps together with the required documentation.

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Dejan Kosutic
Lead ISO 27001/22301 Expert, Advisera


ISO 27001 & ISO 22301
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