Abstract : The effects of intermittent work patterns and funding on the costs of ship repair and maintenance were modeled for the San Diego region in 2002 for Supervisor of Shipbuilding and Repair (SUPSHIP) San Diego. One of the shipyards that participated in the study requested that CACI adapt the general regional model to a more specific, proprietary model for proposal development purposes. This paper reports on the development of the shipyard workflow model, as well as its validation and verification using historical data. The model allows the shipyard to experiment with different patterns of work, availability schedules, hours, repair availability length and start dates to determine the overall loading of the shipyard's 17 trades over one or more fiscal years. It incorporates human resources, scheduling, financial, infrastructure and work sectors. Important factors considered in the model are volume, productivity, experience, man-day rate and error rate. The model estimates work to be scheduled, actual work accomplished, workforce used and the cost to the government.