The location of each item also has to be identified on the catalogue. How is this done? There are various options; a lot will depend on the features of the catalogue. Newcastle uses the Dynix system. In the slide you can see how a three-letter code HEA (Health) in a field called 'shelf'.
Another method is using the same three-letter code, as a prefix to the call number.
We also need to know where to re-shelve the book, so the living room has to be identified on each book.