When we analyse the same data-set by the Web of Science subject categories, we find that the 1,918 papers have been assigned to 167 subject categories.Papers are assigned more than one category, and, of course, the distribution is not equal, with 29 per cent of the papers being assigned to 'Information science, library science', and 0.052 per cent to virology.More recently Julien, Pecoskie and Reed (2011) also considered the diffusion of research in other fields into information behaviour research, in their review of the literature from 1999 to 2008. 21), a significant expansion compared with the situation in 2000 (Julien and Duggan, 2000).
In fact, thirteen of the top twenty journals are health-related, including health informatics, health education, and health libraries.
Only five journals can be described as core information sciences journals, and the final two are in the fields of computer science and chemistry.
After developing two epidemiological models, the authors conclude that, ', simply counting the occurrence of the term in different disciplines, without considering the time it appears to have been introduced into these disciplines.
He finds that, although the largest proportion of uses of the term is in the Web of Science subject category, Literature, it is also found in more than 100 other disciplines.
This study, being preliminary in nature, is most closely related to that of Jacobs, although reasons for the extent and character of diffusion will be advanced. This resulted in a total of 4,059 papers being retrieved.
To focus the results further, the same query was used in only the Title field, on the assumption that this would result in papers that dealt with the topic as the main subject, while a search in the Topic field would also retrieve papers that simply mentioned the subject without it being the main subject of research.
A further analysis was carried out on the distribution of citations over Web of Science research areas, to key works by four frequently-cited authors: Dervin, Kuhlthau, Savolainen and Wilson.
The overall output of papers on the topic shows an exponential growth pattern since the early 1960s, as the red trend-line in Figure 1 indicates.
Later, Julien (1996), carried out a content analysis of the information needs and uses literature, finding that some 20% of citations were to research in fields outside of information science.
She noted that, compared with the interdisciplinarity of other fields, this was a relatively modest proportion.