Different configurations of stiffened panels used in shipbuilding are analysed. From this analysis, data models are produced and a description is given of the functionalities required for their generation as solid models. The methodologies for their geometric definition and representation are presented for application in systems in which the hull-moulded shape is described by parametric surfaces. The concepts presented provide the basis for the implementation of a tool for the creation of stiffened panels, which is to be a general-purpose component in a computer-aided ship design system.