An OOA model with system function specifications

A new OOA model and methodology are proposed. The proposed OOA model is composed of an object model, which specifies objects and the relationships between them, and a function model, which specifies system functions and their operation logic. The proposed OOA methodology develops the specifications of objects and system functions in parallel by following a functional refinement process. Since system functions are specified clearly in the OOA model, the user can easily understand what the system can do by tracing its specification. The object model and function model are developed in parallel, so the consistency between system functions and objects are kept throughout the OOA process