use case

/Y UW1 S K EY0 S/
noun
  1. 1

    A potential scenario in which a system receives an external request (such as user input) and responds to it; used in software design.

  2. 2

    A usage scenario for a piece of software; often used in the plural to suggest situations where a piece of software may be useful.

Source: https://en.wiktionary.org/wiki/use%20case