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Goal-Satisfaction Verification to Combination of Use Case Components

Functional requirements of a system can be specified by fundamental use cases that satisfy "the effective and useful scenarios in the system usage" so as to meet "the goal of the system". Ambiguous non-functional requirements against the system goal often cause uncertainty of use cases and scenarios at the early stage of software development. In this paper, from the viewpoint of non-functional requirements that are included in the goal, we discuss how to check satisfaction of the goal due to the combination of functional requirements during requirements analysis using an example.