Figure 1
UoL's full-text download usage statistics from the SpringerLink platform between August 2008 and November 2011, showing the growth in total usage and the increasing proportion of book chapter downloads.
Figure 2
The difference between UoL's SpringerLink full-text journal article and book chapter downloads between October 2010 and November 2011 and those between October 2009 and November 2011. EBSCO Discovery Service was launched at the university in October 2010.
Figure 3
Cost per page viewed for an e-book collection that UoL started subscribing to in October 2006. The cost per page viewed varies between about 2p and 3p depending upon the position of the month in the subscription cycle.
Figure 4
Cost per chapter downloaded for UoL's Springer purchases: the 2005-2008 collections purchased in July 2008; the 2009 collection purchased in July 2009; the 2010 collection purchased in January in 2010; and the 2011 collection purchased in January 2011. The earliest-purchased collection shows a cost per chapter of about 80p after three years. The dotted line shows the cost per chapter downloaded for all the purchased collections in combination. Since the most recent purchase it varies between about £1.60 and £2.40 as for a subscription (see Figure 3).
Figure 5
Cost per title viewed for an aggregator platform on which UoL has been purchasing single e-books every month since February 2009. These usage figures are from the platform's COUNTER BR1 report. The platform also started to offer a BR2 report in September 2010 but these figures are not included in the graph.
Figure 6
The proportion of titles in each of UoL's Springer collections that have seen at least one full-text download since the collection was purchased. Note that in 2010 the library started buying Springer collections at the start of the calendar year – when the collection had started to be made live – whereas in previous years collections had been purchased in July when much more of the collection was already online This is reflected in the apparently slower take up of the 2010 and 2011 collections.
Figure 7
The proportion of titles in each of UoL's Springer 2005–2008 subject collections that have seen at least one full-text download since the collection was purchased. The collections of 2005–2008 titles were chosen as these had all been owned throughout the period under study.
Figure 8
Modelling of Springer 2008 collection COUNTER statistics against a PDA model whereby ten page views are required to trigger a PDA purchase. The model varies the number of chapter downloads required to reach this ten-page threshold from two chapters to ten chapters.