While original cataloguing allows for on-site, immediate, and locally applied cataloguing, there are some concerns. The teacher-librarian's time can be much better spent working with teachers and students. In addition, library technician and library clerk time in school libraries is usually at a premium. Lack of library technician and library clerk time usually results in a backlog of materials which have not been catalogued or processed fully. These materials cannot be used by staff or students.
Inexperienced cataloguers spend long hours misapplying rules.
Thus, the advantages of using a standard system are often negated and re-cataloguing is often necessary at a future date. Cataloguing is an expensive process when done by unqualified personnel. Derived Cataloguing Derived or copy cataloguing refers to the process of cataloguing items by using existing bibliographic records obtained from various sources and altering those records to conform to local cataloguing standards. While derived cataloguing does result in definite cataloguing savings, both in terms of cost and time, it should be noted that catalogue cards still must be typed manually or cataloguing records must be entered manually into an automated library system. Furthermore, cataloguing standards and formats may vary from catalogue to catalogue.