It would be great to see a transfer schedule set in place so that Koha could take into account days where items are not transferred in and out of a library, and take that into consideration along with the cost matrix.  Some libraries only do transfers 1 or 2 times a week, where others transfer 5-7 times a week, or even more.

For example:

Patron at Library A requests item
On Monday:
Library B has item, and is best suited according to the cost matrix.
Library C has item, and is next best suited according to the cost matrix.

What the cost matrix doesn't take into account is that Library B won't transfer any items out until Thursday.  Library C transfers daily.

So, what happens?  The request goes to Library B's queue, and sits in a bin until Thursday.  The patron doesn't get the item until Friday, or possibly Monday.  However, if transfer days were taken into consideration, the patron could get the item from Library C in a day or two, and the item at Library B doesn't have to sit in a bin for a week.

The queue needs to first look at what libraries are transferring, either that day, or the day before (depending on the time of day the holds are pulled and processed and when transfers are picked up), and of those libraries that are close to transfer, then be assessed by the cost matrix.

Also, if an item isn't processed at that library (maybe they missed the window), it is reassessed the next day.  Perhaps it didn't get pulled and scanned before transfers that day.  Now another library might be a better candidate.

Of course the transfer schedule, the buffer (how soon before transfer does the library become eligible), and daily reassessment should all be preferences to be set.

Anyway, this would be a good addition to the holds queue system.

Christopher