Generic Safety Requirements Description Templates for the Embedded Software

It is generally believed that the correct description of safety requirements is the key of the whole safety work. However, there is not safety standard that is abided by in the requirements description now and the natural language with which there is no difference between the safety description and the function description is widely used in industry. Currently, the parameterized safety requirements templates are applicable in European industry but based on English. In order to find out appropriate safety requirements description templates, this paper represents safety requirements description templates for the embedded software based on the UML modeling mechanism and the content of GJB 438B-2009. The steps about how to put forward the safety requirements templates are shown following: Firstly, the structural elements of the static structure and dynamic operation are respectively found out according to the modeling mechanism of UML; Secondly, the failure modes on structural elements are presented; Thirdly, the safety requirements are obtained by presenting safety strategies in the view of failure avoidance, failure detection, failure tolerance and alarm and so on; Finally, The safety requirements description templates which include safety requirements structural elements description templates and safety requirements sentence pattern description templates are proposed based on obtained structural elements, failure modes, safety trategies and the content of GJB 438B-2009. The proposed safety requirements description templates which give criterions in requirements description are beneficial to promote the understanding and communication between engineering technicians and improve embedded software safety level.