Understanding the impact of software design patterns and deisgn defects

软件维护的成本至少占软件开发总成本的50%。这一比例很高，因为处于维护状态的程序通常具有较差的质量特征——尤其是低可维护性——这是由开发人员的高周转率、时间压力、缺乏明确的设计选择和架构漂移造成的。建议研究的目标是评估设计模式和设计缺陷对可维护性的影响：评估维护者对设计模式的使用，并开发和应用一种方法来检测和纠正设计缺陷。这种评估和方法将加深我们对软件维护的理解，并允许开发工具来提高程序的质量，从而降低维护成本。

The cost of software maintenance amounts to at least 50% of the overall cost of software development. This percentage is high because programs under maintenance generally have poor quality characteristics---especially low maintainability---resulting from the developers' high turnover rate, time pressure, lack of explicit design choices, and architectural drift. The goal of the proposed research is to evaluate the impact of design patterns and design defects on maintainability: to assess the use of design patterns by maintainers and to develop and apply a methodology to detect and to correct design defects. This assessment and methodology will deepen our understanding of software maintenance and allow the development of tools to improve the quality of programs and thus reduce the cost of maintenance.