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Methods used.
| No. | Methods Used | Frequency | Percentage |
|---|---|---|---|
| 1 | Model based | 1 | 2% |
| 2 | Scenario-based | 1 | 2% |
| 3 | Case study | 13 | 25% |
| 4 | Field test | 6 | 12% |
| 5 | Unclear | 1 | 2% |
| 6 | Experiment based | 9 | 18% |
| 7 | Lab test | 2 | 4% |
| 8 | Service-Oriented | 1 | 2% |
| 9 | Field trials | 6 | 12% |
| 10 | Delphi method | 2 | 4% |
| 11 | Prototyping | 3 | 6% |
| 12 | Action research | 4 | 8% |
| 13 | Design Science | 1 | 2% |
| 14 | Mixed Method | 1 | 2% |
| Total | 51 | 100% | |
