抄録
This paper concerns software development methods for railway signalling applications built based on the draft safety-related international standards and the evaluation of the methods. In safety-related computer systems in railway signalling applications, as the greater sophistication of the required functions leads to a larger volume of software, in order to ensure the safety and improve the productivity of the software, it is necessary to build up software development methods to ensure that the work in each phase of the software lifecycle can be strictly implemented, with no loss of time. The author first discusses the experience of establishing and implementing software development methods based on a draft of the international standard IEC 61508, which prescribes the development process for safety-related software. In addition, the author makes a comparison verification between the case in which conventional mainstream methods are used and case in which methods are used that conform to the international standards, using field data based on examples of the same system; the author finds that the latter are more effective for productivity and software quality improvement, and make clear the usability of the safety-related international standards.
