ABSTRACT
This paper illustrates the GBS SLA approach to ship design. It presents a method for defining Tier I (Goals) and Tier II (Functional Requirements) in the five-tier IMO GBS SLA framework. Historical data from the IHS Fairplay casualty database is used to quantify goals in terms of risk parameters such as frequency of undesirable events. These frequencies represent the current safety level for specific ship types. Reliability has to be increased for certain ship functions if a higher safety level is desired for new or existing ships. The paper identifies these ship functions and sub-functions based on their criticality to risk and defines functional requirements expressed as functional failure frequencies. The methodology for allocating functional requirements expressed as reliability requirements of associated ship systems is also presented.
