Table 4: Factors and their labels (co-citation counts, 1996-2000)

Label

Size

Highest loading

Label

Size

Highest loading

User studies

26

0.91

OPAC

7

0.98

IR systems

24

0.97

Bibliometric models and distributions

6

0.85

Collaboration

18

0.95

Metadata

3

0.93

Mapping of Science

13

0.89

Historical and theoretical perspectives

3

0.77

Scientometrics

9

0.81

Usability

3

0.76

Assessment of networked library services

8

0.83