The paper reports on the results of the project ‘Evaluating the usage and impact of e-journals in the UK’. Using deep log analysis techniques, we evaluated the use of the Oxford Journals database in regard to life sciences, economics and history by 10 major UK research institutions. The aim of the study was to investigate researchers’ digital behaviour, and to ascertain whether it varied by subjects and disciplines, or in relation to the institutions. The findings revealed significant subject and institutional differences. Life scientists were the biggest users. Economists made the greatest use of abstracts. Historians proved to be the most active searchers. Research intensive universities were characterized by high volume use and short session times, light sessions, and sessions which utilized few of the search functions available. Open access journals featured strongly in the ranked lists of life sciences and history; and Google was an extremely popular means of accessing journal content, especially so in the case of historians.