Prediction of Software defects in SDLC using BN

This project reviews the use of Bays Networks (BNs) in software defects Prediction. The idea allows us to incorporate causal pro-cess factors. It does the combination of qualitative and quanti-tative software measures. It stops to play some well-known tra-ditional software metrics methods limitations. Decision support tools for this have been built using causal models represented by Bays Networks (BNs), incorporate empirical data and judg-ment of experts. Previously, this required a custom BN for each development lifecycle phase. We described a more general idea that allows causal models to be applied to any lifecycle phases. The approach is evolved through collaborative projects and cap-tures significant commercial input. For software projects within the range of the models, accuracy of defect predictions are very good. The main functions provided to the end-user is observa-tions and can be entered using a questionnaire interface, where questions are concerned to Bays Network variables. The model predicts the defects likely to be left in software after testing. The model uses the results of statistical analysis on the Previ-ous software projects. It can be combined with other defect pre-diction models to predict the number of residual defects of dif-ferent categories. The Bayesian network structure is, here, a set of project domain conditional independence relation. BN learn-ing structure which represents a domain. This domain can light on its underlying causal structure. This results in significantly im-proved accuracy for defects and reliability prediction type models