Software reliability models — A comparative study

Software reliability defined as the probability of failure free operation for a specified period of time in a specified environment. Developing reliable software is one of the most difficult problems facing the reliability is known from customer feedback in the form of defects. A number of software reliability models have evolved since early 1970 to predict software reliability. This paper surveys the evolution of reliability models and purpose an approach in the selection of an appropriate model for different phases of software development lifecycle (SDLC).