“…We review the papers that were published in one year before data collection. The results show that literature reviews [ 8 , 16 , 25 , 35 , 43 , 51 , 55 , 67 , 79 , 91 ] and case studies [ 2 , 4 , 9 , 17 , 24 , 30 , 54 , 61 , 83 , 88 ] are still the predominant research methods, although more sophisticated methods of research are starting to become adopted, though, such as systematic literature reviews [ 15 ], comparative analysis of the investment criteria and other reports [ 33 ], interviews [ 23 , 81 ] and surveys [ 32 , 50 , 66 , 90 ].…”