2 - Definitions
For the purposes of these Guidelines, the following definitions apply:
2.1 Alternative design and arrangements means measures which deviate from the prescriptive requirement(s) of SOLAS chapters II-1 or III, but are suitable to satisfy the intent of that chapter. The term includes a wide range of measures, including alternative shipboard structures and systems based on novel or unique designs, as well as traditional shipboard structures and systems that are installed in alternative arrangements or configurations.
2.2 Design casualty means an engineering description of the development and severity of a casualty for use in a design scenario.
2.3 Design casualty scenario means a set of conditions that defines the development and severity of a casualty within and through ship space(s) or systems and describes specific factors relevant to a casualty of concern.
2.4 Functional requirements explain, in general terms, what function the system under consideration should provide to meet the safety objectives of SOLAS.
2.5 Performance criteria are measurable quantities to be used to evaluate the adequacy of trial designs.
2.6 Prescriptive based design or prescriptive design means a design of safety measures which comply with the regulatory requirements set out in parts C, D and E of SOLAS chapter II-1 and/or chapter III, as applicable.
2.7 Safety margin means adjustments made to compensate for uncertainties in the methods and assumptions used to evaluate the alternative design, e.g. in the determination of performance criteria or in the engineering models used to assess the consequences of a casualty.
2.8 Sensitivity analysis means an analysis to determine the effect of changes in individual input parameters on the results of a given model or calculation method.
2.9 SOLAS means the International Convention for the Safety of Life at Sea, 1974, as amended.