This thesis presents a methodology to improve the effectiveness of a ship design process. This methodology consists of performing systems engineering by means of a tailored framework and subsequent guideline. The first is a tool for designers to identify and define operational objectives and functional requirements of (sub)systems, to make adequate allocations and to divide the systems using functional breakdown structures and systems breakdown structures. The second enables designers to implement the new approach during the concept development phase. The methodology ensures clear and traceable contract specifications, to be re-used for future designs of new standard vessels.