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APPENDIX: BASIC DESCRIPTION OF
THE LIBRARY CASE
The library described hereafter is one of the branches of the public library of Delftown.
In the building in which it is located is a desk for lending topics (the out-desk) and a desk
for returning topics (the in-desk). The in-desk is occupied by Louise and the out-desk by
Tim and Kevin on turn. There is a third desk, called the information desk, which is occupied
by Lisa. The topics that may be borrowed are put on shelves, sorted on the category of the
title. Every (copy of a) topic is identifi ed by a bar code.
At the information desk one can get information such as opening hours, loan rules, and
membership fees, and of course about the topics. There is a binder on Lisa's desk, which
contains the complete library catalog, sorted in several ways (on author, on category and
on title). One can freely browse through the binder to fi nd the topic one is looking for. Next
to that, one can ask Lisa about the topics in the catalog.
