This paper address the preliminary considerations in a research project, initiated February 1997, regarding Continuous Acquisition and Life-cycle Support (CALS) which is a part of the activities in CALS Center Denmark. The CALS concept is presented focusing on the Product State Model (PSM). The PSM incorporates relevant information about each stage of the production process.The paper will describe the research object, the model object and discuss a part of the methodology in developing a Product State Model. The project is primarily technological, however, organisational and human aspects will be considered, as the intentions are that a prototype should be implemented in the production line at Odense Steel Shipyard. Hence, a Multiview approach will be considered incorporating the informational need of many actors/machines. Parameter identification, i.e. describing the parameters which PSM will be developed upon, will be discussed. Also, the parameters for evaluating the PSM will be considered. In establishing the theoretical body of knowledge with respect to CALS, an identification of schools and paradigms within the research area of applying information technology in a manufacturing environment will be provided. Focus will be put on exchange and sharing of product information in the production. Criteria for choosing certain theories upon which CALS can be supported will also be discussed.