Hello all, (and mainly joshua) The popularity, in dev_week, is stored in items (952). That is wrong according to me, because, if a book we have 4 items is issued 20+19+31+38=98 times, it's much more popular than a book issued 45+0+0+0 times That's why I propose to move the popularity field to a biblio area. The popularity field is indexed in zebra through update_items.pl script. I suggest using a non standard MARC field for this. For UNIMARC, I think 2xx area (descriptive informations) could be a good candidate. I choose (randomly) 349$a to store it. It will contain summ(items.issues) where biblionumber=xx I modify update_items & zebra config files accordingly, let me know if you are OK with this suggestion + let me know what to use in MARC21. -- Paul POULAIN et Henri Damien LAURENT Consultants indépendants en logiciels libres et bibliothéconomie (http://www.koha-fr.org) Tel : 04 91 31 45 19