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This paper presents a work domain analysis of dam- age control on the Canadian Halifax Class frigate. Our analysis made use of the modeling construct of object worlds to help in defining the work domain to model and to help in understanding the results of this model compared to other work domain analyses developed in the naval domain. This paper makes a practical contribution through the presentation of a detailed example of work domain analysis in a new domain and a theoretical contribution by clarifying the use of object worlds in work domain analysis, analyzing the way in which object worlds can be understood in systems where the various stakeholders are closely coordinated and promoting object worlds as a way to control model scope. [ABSTRACT FROM AUTHOR]