Skip to main content

Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock () or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Operating Systems

Operations Research

Opinion Surveys

Search our library’s catalog with this term

Scientific methodology for examining, defining, analyzing, and solving complex problems.


Broad Terms:

Search again