Deflection: A process that can happen multiple times within the life cycle of a request using lending rules set up in the Policies Directory (PD). Note that the deflection is performed on the lender string. A simple scenario for deflection by format would be:
Borrowing library creates a request choosing lenders that appear to be suppliers for the material (just like it is today).
WorldCat Resource Sharing (WCRS) searches the first lender's policies in the Policies Directory to see if they will loan that format.
For example, the format is "score" and the first lender has excluded scores from their lending policy in the Policies Directory.
WCRS gets that answer from the Policies Directory, and instead of the lender getting the request as Pending, it skips that lender and automatically deflects to the next lender.
WCRS goes back to step B above, and the request moves through the string until it identifies a lender that might supply it.
Filtering: An upfront process that chooses lenders based on holdings data and other info from the holdings record before the request is created (produced). It takes place before the lender string is built. The Policies Directory is not involved with this processing.
Note: Filtering impacts the lender string that is created, i.e., a symbol can be excluded from the lender string based on the filter that is applied. The only filtering that WorldCat Resource Sharing supports is the filtering of custom holdings paths/groups based on volume and year data in the local holding record.
If you have multiple deflection policies, requests will be processed in the order the deflection policies are created.
For example, when a request comes through WorldCat Resource Sharing, it looks at policy #1. If the request doesn’t meet the criteria to be deflected, it will go on to policy #2. If it meets the criteria for deflection, the request will be deflected and move on to the next lender.
At first, deflection will be included in the Reasons for No Reports in OCLC Usage Statistics, which will be updated with new reasons for no to reflect deflection policies. This will affect both the Lender and Borrower Reasons for No Reports.