“…Based on Table 1, we can claim that our study is the broadest among the seven studies of the related work, as it includes 180 papers. In terms of research method, we identified only two existing SMS about VP, from which the first one by Rafique et al [7] cannot be considered as up-to-date as it reviewed papers until 2014, while the second one by Bhuiyan et al [10] examines only one of our research goals and only for papers using bug reports. Considering in detail the research goals, our SMS has a wide focus and provides an in-breadth analysis, as it covers the whole VP process, beginning from the research goal, continuing with the dataset construction step, the model construction step and ending with the evaluation of the approaches step.…”