“…According to the number of articles for each task, ML techniques are more commonly used for Bug Localization than for Traceability Link Recovery or for Feature Location. While 47% of the articles apply ML techniques for Bug [14], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [60], [61], [62], [63], [64], [65], [66], [67], [68], [69], [70], [71], [72], [73], [74], [75], [76], [77], [78], [79], [80], [81], [82], [83], [84], [85] [10], [86], [87], [88], [89], [90], [91], [92], [93], [94], [95], [96], [97],…”