I'm currently using Koha to catalog a collection of mostly non-book resources at my school, many of which are stored on physical DVDs and/or online available for download. I'm thinking of re-purposing some of Koha's major data fields where their usual meaning isn't all that relevant to this project. For example, I plan to create my call numbers so they are sufficient to identify the physical location within a given branch. This will free up "Collection" and "Shelf Location" for other, more relevant classifications. Before I start mapping this out, I first want to get feedback that I'm not way off-track thinking this way. First question: I believe that the original intention was a hierarchy for physical location: Home branch --> Collection --> Shelving location --> Call number If I re-purpose these fields so that e.g. Collection is used for distinguishing between "Disc-Data" vs "Disc-Video" vs "Disc-Mixed", is their any remnant of the above original hierarchy that will cause trouble? Is Collection completely independent of Branch in the database and UI design, or is there some enforcement of one Collection being "contained" within a Branch? Same question of course with Shelving location relative to both Collection and Branch - say I used this field to map to "Age Appropriateness" (Adult-only, Young adult, Juvenile, Early learners). Note that the Age factor is a biblio level one, while many biblios will have both a Data and a Video disc - a member may want to borrow only one or both. Next question is - are these easily used as search factors in the OPAC, so members can browse a subject only looking at VDO discs suitable for Juveniles? I don't mind a bit of customization, assuming this can be preserved across upgrades. Obviously the latter fits well within Item type, but this seems designed for factors that are affect circulation policies - loan duration, charges etc. Last question - is that field even available as a search limiter? I could use "Film-Disc-Data" and "Film-Disc-Video" or "Film-Disc-Mixed", but many members don't care about the distinction, so I'm thinking it would be simplest to just use "Film" as a monolithic category and not worry about the media details there; as I'd rather have them manually pick and choose among their results than have to run multiple searches. Obviously besides having the direct questions addressed, any general ideas or suggestions would be most welcome.