Research on dependability life cycle model for software system

Dependability is an intrinsic attribute of a system and a key decision factor for evaluating and accepting successful system performance. The dependability of a system is affected by different factors in different stages of its life cycle, and it must be properly managed. The key to achieve dependability is to adopt a life-cycle approach to obtain dependability. This paper analyzes the meaning of dependability life cycle, and on the basis of introducing the existing system, data and product life cycle models, constructs the system dependability life cycle model, including concept, development, realization, utilization and retirement/re-use of five life cycle stages. Considering the wide application of software system, the dependability life cycle model of software system is further studied and established. The implementation of dependability activities in each phase of the system life cycle can promote the realization of system dependability and create dependability value.