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    ISO 27001 & ISO 22301 Blog

    How detailed should the ISO 27001 documents be?


    When starting to write a policy or a procedure, you’re probably puzzled as to how lengthy it should be. And the truth is, ISO 27001 (as well as other ISO standards like ISO 20000, ISO 9001ISO 14001 and others) are very flexible in this respect. They basically allow you the freedom to decide for yourself what level of detail you are going to write in your documents.

    Criteria for deciding on the level of detail

    So, before you start writing your documentation, you should go through these criteria to decide how detailed your policies and procedures should be:

    Level of complexity. The more complex the process or activity is, the more details you will have to write. Of course, if your process has 5 very simple steps you will write your whole procedure in a single page, but if the process has 100 steps – some of which are really difficult – you may come up with a document that is a few dozen pages long.

    Maturity. If a process or activity is complex, but practice has proved there are few problems with it because employees have been performing it the same way for years and know exactly how it is done, you don’t have to write a very lengthy document.

    How often they are performed. If the process or activity is performed rarely, then you will probably have to explain it in more detail – this is because your employees will tend to forget how the process or activity is done; if it is performed very regularly, the document will be much shorter.

    Importance/risks. The more important the activity or process is, the more detailed the documents tend to be, because you’ll want to make sure everyone understands exactly how to perform it. For example, if you have many risks that are related to information systems access control, you should describe those rules in more detail; on the other hand, if your physical security is not really an issue, you will describe it only generally (or avoid writing a document at all).

    Compliance. In some cases, you will have auditors coming to your company from regulatory bodies and/or from your important clients – if they expect to see a very detailed, e.g., BYOD policy, then make your life easier and give them that nice-looking, detailed policy.

    The decision on how many documents you want to have and how detailed they should be is a strategic one – you should make such a decision even before starting your ISO 27001 project. See also: 8 criteria to decide which ISO 27001 policies and procedures to write.

    Once you start writing the documents, use this article: Seven steps for implementing policies and procedures.

    Problems with complex documentation

    Many information security professionals fall into the trap of thinking “we’ll describe all the security rules in detail → everyone will know exactly what to do → we will have higher level of security,” but it doesn’t work this way. Complex documents require a lot of effort to maintain, and even worse: employees dislike reading lengthy policies and procedures.

    So remember, the fewer documents you have and the less complex they are, the greater the chances your employees will comply with them. Therefore, don’t get too ambitious when writing your documents; but do get ambitious in asking the security rules to be implemented.

    See here free samples of documents that are optimized for smaller and mid-sized companies: Free preview of ISO 27001 Documentation Toolkit.

    Here you can learn about the ISO 27001 requirements and structure.

    Advisera Dejan Kosutic
    Author
    Dejan Kosutic
    Dejan holds a number of certifications, including Certified Management Consultant, ISO 27001 Lead Auditor, ISO 9001 Lead Auditor, and Associate Business Continuity Professional. Dejan leads our team in managing several websites that specialize in supporting ISO and IT professionals in their understanding and successful implementation of top international standards. Dejan earned his MBA from Henley Management College, and has extensive experience in investment, insurance, and banking. He is renowned for his expertise in international standards for business continuity and information security – ISO 22301 & ISO 27001 – and for authoring several related web tutorials, documentation toolkits, and books.