The application of use cases in systems analysis and design specification

In this paper we therefore investigate the application of use case structures in the initial design phases of software development. A novel approach is proposed that applies a state based use case model directly to each object in the design architecture. This requires the derivation of a set of repeatable refinement procedures, which remove redundancy and allow the assignment of behaviour to objects with respect to their responsibilities. It is then shown how such procedures may be used in design, filling the semantic gap between analysis and design. By applying the procedures to a case study we identify and evaluate the characteristics of the mapping from use case model to object behaviour and review our approach with respect to other methods. It is concluded that state based use case structures not only represent a succinct analysis format, but may also be used to map analysis models directly into the design process.