In their role as exclusive UK ISBN registrar, Nielsen Book has issued a statement indicating they will exclude from their database titles that use a single ISBN to represent all e-book forms of a particular. In other words they are rejecting that practice that is currently favored by most large publishers, requiring the assignment of a different ISBN to each different electronic edition of the same title. As quoted from the statement in the Bookseller, Nielsen notes that “we acknowledge that [publishers'[ e-book initiatives to date may not have required per-format identification…. We believe that hardwiring bibliographic and identification practice […]