I am trying to understand how one goes about cataloging a collection and have a question for the list. Is there an "official" numbering system that is agreed upon by all or does everyone just make up a database for their particular collection? From what I have read in the archives, my understanding is that each individual creates his/her own unique set of alpha/numerical values. Is there a reason that these numbering systems are not standardized? I would think that a standard numbering system would eliminate many of the problems encountered when an individual's data key to the collection is lost or inadvertently thrown away when the collection is passed along to others. Since taxonomy is so precise, it seems only logical, to me at least, that a systematic numbering system could be created and accepted as an international standard as well. I know that I am probably taking a simplistic view of the problem, but I am baffled and confused by this lack of a standard system. Thank you for any help and clarification you can give me on this issue. Mary Canada