Skip to main content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
Banner Image

Standards: Main

This subject guide covers major sets of standards available at NUS Libraries: SS, BS, IEC, IEEE and ASTM.


What is a Standard?

According to the International Organization for Standardization (ISO), a standard is a document that provides requirements, specifications, guidelines or characteristics that can be used consistently to ensure that materials, products, processes and services are fit for their purpose. 

Standard Number

Standards are generally identified by standard reference numbers, which have 2 components: 

  • a prefix consisting of letters (e.g., ISO, EN, BS,) which indicate the standards body that approved them
  • a number, which identifies the specific standard

Adoption of Standards

The standards reference number usually gives an indication of adoption where standards are equivalent.

Let's look at an example: UNI EN ISO 9001

  • ISO 9001 is a standard originally approved by ISO
  • It was adopted by Comite Europeen de Normalisation, and the standard has reference EN ISO 9001
  • It then got adopted by the Italian national standard body (UNI). This standard has reference UNI EN ISO 90

The three standards, ISO 9001, EN ISO 9001 and UNI EN ISO 9001 are identical other than the reference numbers.

Question: The library does not have Italian Standards. What if you need UNI EN ISO 9001?

NUS Libraries has a good set of British Standards (We subscribe to British Standards Online). Since the British has also adopted ISO 9001, you can search for the version that is adopted by the British (i.e. BS EN ISO 9001) since the content is identical to UNI EN ISO 9001.

Resource Librarian

Patsy Chia's picture
Patsy Chia
NUS Central Library
+65 6601 7083

Resource Librarian

Patrick Pu's picture
Patrick Pu
NUS Central Library
Phone: +65 6601 7088