Hello I've helped set up a library for our primary school over the past 8 months or so. Koha was a possible candidate for our computer system but I couldn't get it going in time. But it's probable that we will change systems next year, and I will propose Koha again. Why I'm writing is that we are about to reshelve all the books, and I want to use the opportunity to put barcodes on them. I think we've got a volunteer to print them all using kbarcode (found the reference here) but our ignorance of barcodes themselves is still profound. What I want to do is print barcodes that will be accepted by any library software, so I need a specification. I see things like EAN 12, UPC, 3 of 9 (not 7 of 9?). I don't want to know what they mean, I just want someone to say "use a 13 digit number, EAN 12 coding, don't use letters and everything will be all right". Is such a specification possible? Or do I have to know what they mean. ( If so I'll just buy the barcodes from Junior Librarian, which is the system the headmistress wants - but I want to spend the money on books) Our books are numbered from 1 to 6500 and I intend to use those numbers as barcode numbers. Many thanks for any advice George Jenner