Figure 1

Figure 2

Figure 3a

Figure 3b

Figure 4a

Figure 4b

Figure 5 a

Figure 5b

Figure 6a

Figure 6b

Figure 7a

Figure 7b

Formal background data structure based on the formal context_
| Term1 | Term2 | … | Termn | ||
|---|---|---|---|---|---|
| DIS1 | A11 | A12 | A1n | ||
| DIS2 | A21 | … | |||
| … | … | … | |||
| DISm | Am1 | Amn |
Formal conceptual background in 2007 (partial data)_
| User’s information needs Information technology | Information retrieval | Citation data and analysis methods | Qualitative analysis | |
|---|---|---|---|---|
| Computer Science-Information Systems | 1 1 | 1 | 1 | 1 |
| Computer Science-Interdisciplinary | 1 1 | 1 | 1 | 1 |
| Applications | ||||
| Management | 1 1 | 1 | 1 | 1 |
| Communication | 1 1 | 0 | 1 | 1 |
| Multidisciplinary Sciences | 0 0 | 0 | 0 | 0 |
| Medical Informatics | 1 1 | 1 | 1 | 1 |
| Geography | 1 1 | 1 | 0 | 1 |
| Geography-Physical | 1 1 | 1 | 0 | 1 |
| Social Sciences-Interdisciplinary | 0 1 | 0 | 0 | 1 |
| Telecommunications | 1 0 | 0 | 1 | 1 |