This is a look at how many users were accessing the system overall.  To be more accurate, this line graph shows how many sessions were logged during the 10-week period, by week.  A session is started when a user clicks on a link pointing to one of the files associated with the new system and begins performing what are called “search actions,” i.e., moving to another screen, performing a search, or browsing.  Unfortunately, for purposes of the ENCompass log data, we found that sessions ended not only by exiting the system and/or closing the browser but also by clicking on the browser back button.  This meant that if users hit the browser back button rather than navigational buttons provided in the interface itself, a new session ID would be logged automatically.  This problem needs to be addressed in future in order to ensure a more accurate count of session IDs.
	Also, remember that we are looking at data during the time period when the old e-Reference system was still in use, so numbers here would be much higher once only one system was in place.