Abstract. When tasked with the development of a large and complex system of systems it is necessary that a project operates according to current best practice in all domains including systems engineering. These practices have been documented by organisations such as INCOSE and the International Organisation for Standardisation (ISO). Model-based systems engineering (MBSE) is currently considered a best practice approach to the specification, design, analysis and verification of a complex system. A model-based design approach can leverage the benefits of a system model to integrate multiple domains in a more precise, consistent, traceable and re-usable format than traditional document-centric design processes. ISO-15288, published by ISO, is a world-wide standard for systems and software engineering lifecycle processes. This standard defines a framework of processes that can be applied to a system throughout its full lifecycle, including requirements definition and analysis, architectural design, implementation and verification. The Object-Oriented Systems Engineering Method (OOSEM) was developed in 1998 and has since been refined by the INCOSE OOSEM Working Group and others. When applied in conjunction with the Systems Modelling Language (SysML), OOSEM is widely advocated as an example of MBSE best practice. In Deep Blue Tech (DBT), submarine concept formulation activities are supported by a framework of model-based SE processes. Motivated by the introduction of MBSE to a requirements analysis and design team, a study was undertaken to explore a mapping between DBT design processes and the integrated processes defined in OOSEM and ISO-15288. This paper will discuss a number of observations from the study and how they were used to update DBT processes to enable a successful development strategy
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