“…The important thing is that the found studies are a good representation of the population, which we ensured in this study by adopting a rigorous paper selection process. All Stages Approach/Technique/Method RNN [63] All Stages Other Other [64] All Stages Other Other [56] All Stages Comparative Analysis Other [57] All Stages Other Other [69] All Stages Other RNN, RBM [14] All Stages Model/Framework Other [67] All Stages Tool RF [49] All Stages Other Other [62] All Stages Tool NLP [61] All Stages Other DT [48] All Stages Other Other [65] All Stages Other Other [1] All Stages Other Other [60] All Stages Other Other [68] All Stages Comparative Analysis LR, SVM, NB [66] All Stages Approach/Technique/Method LSTM [11] All Stages Other Other [59] All Stages Other Other [21] Requirements Approach/Technique/Method NB, KNN, RF [70] Requirements Approach/Technique/Method SVM, SMO, NB [82] Requirements Approach/Technique/Method PN [75] Requirements Model/Framework ProbPoly [71] Requirements Approach/Technique/Method Text2Model [84] Requirements Approach/Technique/Method RF [72] Requirements Approach/Technique/Method Other [22] Requirements Approach/Technique/Method NB, RF, LR, SGD, DT [23] Requirements Approach/Technique/Method Boosting [81] Requirements Approach/Technique/Method NSGA-II algorithm [24] Requirements Model/Framework CNN [73] Requirements Approach/Technique/Method FL [76] Requirements Approach/Technique/Method LP, SMO, NB, KNN [86] Requirements Approach/Technique/Method J48, FSS, CFS [25] Requirements Model/Framework RNN [85] Requirements Model/Framework KNN [...…”