Figure 5
Panel a displays percentage values for five categories. The data from the chart in the clockwise sense are as follows: “Case study”: 23 percent. “Interview”: 22 percent. “Survey”: 22 percent. “Theoretical framework development”: 22 percent. “Observational study and Interview”: 11 percent. Panel b displays percentage values for five categories. The data from the chart in the clockwise sense are as follows: “Optimisation”: 72 percent. “Game theory”: 12 percent. “Simulation”: 4 percent. “Hybrid”: 4 percent. “Others”: 8 percent.Classification of papers following (a) qualitative approaches and (b) quantitative approaches. Source(s): Authors’ own work