Spring 2006 DLF Forum: Melvyl Recommender Project, 33
3 April, 2006
Circulation-based
●“Patrons who checked this out, also checked out....”
Not really CF.  CF approach requires
 - qualitative ratings of  items by multiple people
-  knowledge of the user preferences and how those relate to the preferences of other patrons, in order to make good predictions.

Can’t assume check-out => positive “rating”.
- Availability/proximity
- First choice or just convenient?
- Proved relevant or useful?
- Can’t see in-library use, completely digital materials.

NO RATINGS
INCOMPLETE (at best) picture of patron preferences.