Abstract-Software reliability is viewed as one of the key attributes of software quality, an important quality metric for any developed software. The aim is to statistically measure, ensure and predict the reliability of the software product and is accessed by the use of any statistical model, whose unknown parameters are estimated from the available software failure data. Researchers developed Sequential Probability Ratio Test (SPRT) to judge upon reliable/unreliable software based software reliability techniques. An analogy between Burr Type III and Pareto Type II with SPRT mechanism based on time domain data of Non Homogenous Poisson Process (NHPP) is presented here.