Subject-oriented design: towards improved alignmnt of requriements,design and code

摘要

In practice,object-oriented design models have bene less useful throughout the lifetime of software systems than they should be.Design models are often large and monolithic,and the structure of the designs is generally quite different from that of requreimetns.As a result,developers tend to discard the design,especially as the system evolves,since it is too difficult to keep its relationship to requriements and code accurate,especially when both are changing.This paper presents a different approach to designign systems,based on flexible decomposition and composition,that closely alighns deisgns with both requreiments specifications andf with code.We illustrate how this approach permits the benefits of designs to be maintained throughout a system's lifetime.