“…Nine [12], [6], [46], [47], [48], [49], [50], [51] and [52] of the 50 studies indicated that there were challenges that related to a need for identifying and using instructional design guidelines to design mobile training content. Seventeen studies [6], [53], [54], [55], [44], [56], [57], [58], [59], [60], [61], [62], [63], [64], [65], [66], and [67] mentioned challenges related to adapting and appropriating mobile learning technology to learn in a compatible way with suitable learning theories, objectives and actual training/learning needs. The remaining twenty-four studies [6], [68], [69], [70], [71], [72], [10], [73], [37], [74], [1], [8], [75], [16], [76], [38], [45], [77], [78], [79]…”