It is needless to say that a lot of information on process planning and scheduling are very important for production activities. Therefore a lot of efforts have been conducted to develop systems for production planning and scheduling in Japanese shipyards with the advancement of computer technology. In order to develop CIM for shipbuilding, the author implement a product definition system. This system is called SODAS (System Of Design and Assembling for Shipbuilding). In previous papers, systems for process planning and scheduling are discussed. However they are not fully integrated. In this paper a few concepts are introduced, in order to develop production planning for shipbuilding. These are ‘Process Operation’, ‘Task’ and ‘Factory Model’. ‘Process Operation’ and ‘Task’ are models which operate in shipyard operation. ‘Factory Model’ is a model of shipyard. By using a relation between Product Model and ‘Factory Model’, information of ‘Process Operation’ and ‘Task’ are acquired. Information on process planning and scheduling may be generated when good considerations are payed.