Searching the Inspec Classification Index

This search aid allows you to select one or more classification codes to add to your search query. Only the top levels of the hierarchy are shown when initially accessing the Inspec Classification search aid, and includes:

  • Physics 
  • Electrical Engineering &amp Electronics
  • Computers & Control
  • Information Technology
  • Manufacturing & Production Engineering

The product automatically finds records for all classification levels under a second, third, and fourth level classification code. For example, adding the second level code C3000 Control Technology, the product finds records indexed with C3000, C3100, C3200, and C3300 classification codes, including codes that are under them in the hierarchy. You do not have to add all the codes if you select C3000 at the second level.

See Inspec Classification Details for more information about classification codes.


Find Option

  1. Enter a word or phrase in the text box. Boolean operators (AND, OR, NOT) and wildcards (* ? $) are permitted.

  2. Click the Find button to go to a list of terms that contain the characters that you entered.

  3. Click the Add button to select an item from the list. The selected item is added to the text box at the bottom of the page.

  4. Click OK to transfer the selected item(s) to the Search page.


Browse Classification Hierarchy Option

  1. Click the Expand Term Expand Term icon icon to display the narrower levels of a particular classification.

  2. Continue to click the Expand Term Expand Term icon icon at each level in the hierarchy to drill down to the level that contains the classifications code(s) you seek.

  3. Click the Add button to add a classification code to the text box at the bottom of the page.

  4. Click OK to transfer the selected classification code(s) to the search page.


About Scope Notes

Click the View Scope Notes View Scope Notes icon icon to display additional information that describes how a concept code is used and/or provide historical information about its use.


  • optic*
  • *phone*
  • fission OR radioactiv*
  • superconduc* AND magnet*
  • C5000


Did You Know ...

If you want to use a classification code in a Topic search, then enter the code directly in the Topic field.