2.1.1 Functional objectives are defined to provide a structure to the parts of the
                                 Submarine Assurance Framework so that relevant requirements and acceptance criteria
                                 can be captured. They subdivide a Goal into manageable elements, the subdivision may
                                 be based on a logical flow, system breakdown, or process steps. Typically,
                                 functional objectives are associated with Chapters of the Submarine Assurance
                                 Framework. An example of a functional objective might be ‘fire protection
                                 boundaries’. Functional Objectives are equivalent to Tier 2 of the NSubC.