Abstract
The hierarchical decomposition of a general system is a powerful tool in the reduction of complexity, as has been recognized by various authors. It may be used either to simplify an already existing system, or as an aid to the design of a new system. This paper is concerned with decomposition in the latter sense, being an approach to the modular design of complex systems. The proposed approach involves the estimation of the information transfer between the modules of the system. This necessitates the creation of a multivariate binary probability measure representing the problem, which leads in turn to a general criterion for the decomposition of the system into its most independent subsystems, or modules. As an application, the detection of the modular structure of a computer operating system is discussed.
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