Block or module division planning is an important stage in the manufacturing design of ship hull structure and similar steel structures. During module division planning various factors such as crane capacities, hull structural arrangements, outfitting arrangements, material availability etc., must be considered simultaneously. At an early design stage, detailed information on these factors or constraints might not be certain. This uncertainty makes the generation of optimum module division planning difficult. In this paper, a module division planning methodology is proposed for the management of these uncertainties in the information at an early design stage. Using the system various module division plans can be generated, evaluated and ranked considering various factors affecting module division planning and their uncertainties. Based on the evaluation, some of the 'preferable' module division plans can be selected. The system is based on graph theory and fuzzy logic.
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