| Tools | Well known | Frequency level | |||
| Often | Sometimes | Rarely | Never | ||
| Mind map | 76.1 | 38.8 | 42.3 | 6.1 | 12.8 |
| Five WH questions | 62.5 | 38.0 | 37.4 | 8.0 | 5.5 |
| What if… question | 49.5 | 29.2 | 24.5 | 3.7 | 37.9 |
| Internet information | 65.8 | 44.4 | 3.1 | 6.1 | 46.3 |