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    ISO 27001 & ISO 22301 Knowledge base

    If you came across both the ISO 27001 and the ISO 27002, you probably noticed that ISO 27002 is much more detailed, much more precise – so, what’s the purpose of ISO 27001 then?

    First of all, you cannot get certified against ISO 27002 because it is not a management standard. What does a management standard mean? It means that such a standard defines how to run a system, and in case of ISO 27001, it defines the information security management system (ISMS) – therefore, certification against ISO 27001 is possible.

    This management system means that information security must be planned, implemented, monitored, reviewed, and improved. It means that management has its distinct responsibilities, that objectives must be set, measured and reviewed, that internal audits must be carried out and so on. All those elements are defined in ISO 27001, but not in ISO 27002.


    The differences between the controls in ISO 27002 and ISO 27001

    The controls in ISO 27002 are named the same as in Annex A of ISO 27001 – for instance, in ISO 27002, control 6.1.2 is named “Segregation of duties,” while in ISO 27001 it is “A.6.1.2 Segregation of duties.” But, the difference is in the level of detail – on average, ISO 27002 explains one control on one whole page, while ISO 27001 dedicates only one sentence to each control.

    Finally, the difference is that ISO 27002 does not make a distinction between controls applicable to a particular organization, and those which are not. On the other hand, ISO 27001 prescribes a risk assessment to be performed in order to identify for each control whether it is required to decrease the risks, and if it is, to which extent it should be applied.

    The question is: why is it that those two standards exist separately, why haven’t they been merged, bringing together the positive sides of both standards? The answer is usability – if it was a single standard, it would be too complex and too large for practical use.

    Which standard to use from the ISO 27000 series and when

    Every standard from the ISO 27000 series is designed with a certain focus – if you want to build the foundations of information security in your organization, and devise its framework, you should use ISO 27001; if you want to implement controls, you should use ISO 27002, if you want to carry out risk assessment and risk treatment, you should use ISO 27005 etc.

    To conclude, one could say that without the details provided in ISO 27002, controls defined in Annex A of ISO 27001 could not be implemented; however, without the management framework from ISO 27001, ISO 27002 would remain just an isolated effort of a few information security enthusiasts, with no acceptance from the top management and therefore with no real impact on the organization.

    To learn how to become compliant with every clause and control from Annex A and get all the required policies and procedures for controls and clauses, sign up for a 30-day free trial of Conformio, the leading ISO 27001 compliance software.

    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.