Reliability of a software or system is the probability of system to perform its functions adequately for the stated time period under specific environment conditions. In case of component-based software development reliability estimation is a crucial factor. Existing reliability estimation model falls into two broad categories parametric and non-parametric models. Parametric models approximate the model parameters based on the assumptions of fundamental distributions. Non-parametric models enable parameter estimation of the software reliability growth models without any assumptions. We have proposed a novel non-parametric approach for survival analysis of components. Failure data is collected based on which we have calculated failure rate and reliability of the software. Failure rate increases with the time whereas reliability decreases with the time.

In this modern world of development of software, CBD "Component based development" is a methodology dependent upon the novel and innovative thought to produce new software product by picking a number of off-theshelf modules "components" and then after to integrate and bind them all together with a suitable software product. The ultimate objective of component based software engineering is to generate a large computer program termed as module or component by using pre-existing software components therefore reducing and development time. CBSE is also helping in upgrading and maintaining the large software system. This concept is essential because it's assumed that common components can be written once and it can be used indifferent components by using common interface .This paper compares the performance of various models in CBSE on the bases activity provided by that model.

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