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The optimization of complex systems as well as other design methods require a description of the system parameters, or the design space. Explicit encoding of all possible variants is practically impossible, thus an implicit method is needed. While this is easy for purely numerical parameters and a fixed number of them as usually assumed in direct or indirect optimization, it is quite hard for systems in which the architecture and thus the structure of the parameters themselves can be varied. This paper introduces an approach to specify system architecture variants in a concise way and proposes a UML profile for this task. Standard UML meta model elements are used for the description of variant-specific stereotypes. An example of a variant specification for a communication network model is presented.

A UML Profile for the Specification of System Architecture Variants Supporting Design Space Exploration and Optimization