Hierarchical process modeling of submarine command and control systems

It is shown how a recently developed methodology called hierarchical process modeling (HPM) can be utilized to improve the reliability of submarine command and control systems (CCSs). In HPM the subsystems under study are represented by verbs, and the flows between them are represented by nouns. The model is made up of a series of diagrams, all of which carry the CCS label and a number identifying its position in the model hierarchy. The diagrams also give the date the diagram was completed and the revision number for this particular figure. Two types of diagrams are included in the model: a context diagram and an internal structure diagram. The context diagram that defines the relationships between the CCS system and its environment. The latter includes all activities that are outside CCS but relevant to its activities. The internal structure diagram provides a detailed description of the inner workings of the CCS. The methodology is useful for analyzing and improving current systems and for designing future systems