2f333d6f_UX_Techniques__UX_Mastery___Technique
[What It Is] A use case is a list of steps that define the interactions between a user and a system. Use cases, especially when used as requirements for software development, are often constructed in UML, with defined actors and roles. [When To Use It] Analysis [How To Use It] Darren Levy's article, Use Case Examples—13 Killer Tips, written for Business Analysts and Software Engineers, is a good introduction to creating use cases. [Technique] 
Use Cases
UX Techniques -UX Mastery 
Technique