S.R. Ranganathan is considered the father of Library Science. His Five Laws of Library Science (1931):
1. Books are for use.
2. Every book its reader
3. Every reader his book.
4. Save the time for the reader.
5. A library is a growing organism.
is the foundation philosophy of many libraries worldwide.
In his ‘Classified Catalogue Code’ (1989), he said the catalogue should be so designed to :
– Disclose to every reader his or her document;
– Secure for every document its reader;
– Save the time of the reader; and for this purpose
– Save the time of the staff
Do you think it is still relevant to libraries in the digital network age? Welsh and Batley  said, “a well prepared catalogue record may be a beautiful thing to the trained eye, but the true measure of its worth must be in its value to those searching it in finding information. ”
 Welsh, A. and Batley S. (2012) Practical cataloguing: AACR, RDA and MARC21 Chapter 1. (p.2)