ISBN stands for International Standard Book Number. It is a code assigned to every published book that uniquely identifies it in the marketplace. ISBNs make it easier and more efficient for libraries, booksellers and others in the publishing industry to order, distribute and catalog books.
When To Use an ISBN
You need to assign an ISBN to any content you intend to distribute through outside channels such as bookstores, catalogues or libraries. ISBNs should be placed on
-- print books
-- electronic books
-- videos
-- audio cassettes and CDs
-- CD-ROMs, and
-- other items as detailed by the International ISBN Agency.
You need to issue a separate ISBN for each edition of your book and for every format. For example, if you issued the same book as a print book, e-book, audio book and Braille book, you would require a separate identifier for each. If one year later, you updated the manuscript and re-issued the book, you would assign new ISBNs to this second edition in each of its different formats.
Deciphering the Numbering System
All ISBNs are currently 10 digits. (The industry will slowly be transitioning to a 13-digit system starting in 2005. See jtribe@juicedconsulting.com