A software cost model with maintenance and risk costs for safety-critical systems

摘要

According to the consequences of software failures,software faults remaining in safety-critical systems can be classified into two sets;common faults and fatal faults.Common faults cause slight loss when they are activated.A fatal fault can lead to significant loss,and even damage the safety-critical system entirely when it is activated.A software reliability growth model for safety-critical systems is developed based on G-O model.And a software cost model is proposed too.The cost model considers maintenance and risk costs due to software failures.The optimal release policies are discussed to minimize the total software cost.A numerical example is provided to illustrate how to use the results we obtained.