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Please note that your last phrase is not true (“This though is not mandatory since minimum requirement is to leave… “). ISO 27001 does not prescribe the use of two-level setting objectives, neither the use of top-level, topic-specific, and control-specific objectives. It requires only that objectives are defined at relevant functions and levels. This leaves organizations free to adopt objectives that better suit theirs needs.
Considering that, both of your proposed approaches are ok if they fulfill standard’s requirements, but you need to understand that you are defining them this way because you consider they suit your needs the way they are, not because of any standard´s requirement.
For example, you can have:
Note that as you increase the number of levels you increase the complexity, cost, and administrative effort, but also you have more detailed information to identify where potential problem points are. So, you need to evaluate the better scenario for you, remembering that you do not need to define objectives for all departments/processes/controls in your scope. You can start with a single level, then include the most critical departments/processes/controls later, and increase coverage as you gain more experience and maturity managing the objectives.