A study on quality improvement of railway software

The digital system performs more varying and highly complex functions efficiently compared to the existing analog system because software can be flexibly designed and implemented. The flexible design makes it difficult to predict the software failures. Even though the main characteristic of railway system is to ensure safety, nowadays software is widely used in the safety critical railway system just after evaluation of system function itself. The railway system is also safety critical system and the software is widely used in the railway system. For this reason, the safety criteria are suggested to secure the software safety for the field of railway system. The software used in the safety critical system has to be examined whether it is properly developed according to the safety criteria and certification process. This paper also suggests a development methodology for the railway company to easily apply the criteria to the railway system.