It is important to collect and analyze the usage data of electronic databases and periodicals in order to make policies regarding the composition, improvement and more extensive utilization of electronic resources of libraries. The aim of this study is to investigate how efficiently the full text accessible electronic resources of Hacettepe University Libraries are used. For this purpose the usage data obtained from COUNTER Software regarding the electronic databases to which Hacettepe University Libraries subscribed in 2007 were examined. Full-text access to 13,270 journals within 13 electronic databases was found to be 585.843 in 2007. ScienceDirect is the most frequently used database, accounting for 56.1% of all accesses. Some 1,575 journals appear in more than one database and 2,912 journals were never used. A great part of the core journals identified by the Bradford Law are included in the ScienceDirect database.