A software reliability model for operating environments considering exponential distribution

The software systems used in the field environments are the same as or close to those used in the development-testing environment; base on this, existing software reliability models are applied to software testing data and then used to make predictions on the software failures and reliability in the field. However, the systems may be used in many different locations. The Weibull distribution is often used to estimate the lifespan of a product because it has the flexibility to estimate cases where the probability of failure increases, decreases, or remains constant over time. In this paper, we present a new model with consideration for theWeibull fault detection rate in operating environments considering exponential distribution, and examine the goodness-of-fit of the proposed new model and other models based on two datasets. The results show that the proposed new model fits significantly better than other models.