In this paper we have proposed a novel model to achieve the reliability of the system during the development level using a sequence of activities.We have argued that the reliability of the software system may be improved during the development stage and it automatically increases the reliability of the whole system. A majority of mission-critical or safety-critical systems are complex computer-controlled systems, which are increasingly relying on software and software does contribute to system failures. To avoid system failures and crashes, research is being done in one of the key areas know as 'Software reliability analysis' and that is inevitable for software developers. Software reliability is an important metric in determining overall system stability and reliability, through error prevention, fault detection and removal. For this, we have proposed a novel model to achieve the reliability of the system during the development level using a sequence of activities

Key words: Reliability, Safety-Critical Systems, System Crash, Software Reliability Analysis, Fault-Detection